Quarterly report [Sections 13 or 15(d)]

Consolidated Schedule of Investments In and Advances to Affiliates (Details)

v3.25.3
Consolidated Schedule of Investments In and Advances to Affiliates (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Schedule of Investments [Line Items]          
PIK Rate 12.94%   12.94%    
Amount of Realized Gain/(Loss) $ (9,854) $ 25,372 $ (26,141) $ 23,802  
Amount of Unrealized Gain/(Loss) 21,007 (29,749) 35,886 (24,656)  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[2],[3]     1,177,507    
Ending balance [4],[5],[6] 1,260,202   1,260,202    
Control investments          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss) 0 0 5,305 57  
Amount of Unrealized Gain/(Loss) (1,113) 912 (7,014) 4,631  
Amount of Interest, Fees or Dividends Credited to Income     4,249 2,643  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     69,878 [2],[7] 53,644  
Gross Additions     5,167 5,126  
Gross Reductions     14,292 1,937  
Ending balance 60,753 [5],[8] 56,833 60,753 [5],[8] 56,833  
Affiliate investments          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss) (2,321) 0 (2,319) 0  
Amount of Unrealized Gain/(Loss) 9,693 182 12,460 1,166  
Amount of Interest, Fees or Dividends Credited to Income     28,220 22,891  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     351,360 [2],[9] 291,279  
Gross Additions     66,743 61,239  
Gross Reductions     33,732 50,162  
Ending balance $ 392,285 [5],[10] 315,190 $ 392,285 [5],[10] 315,190  
Investment, Identifier [Axis]: Fidelity Government Portfolio Fund Class III          
Schedule of Investments [Line Items]          
Total Rate 3.79%   3.79%   4.13%
Investment, Identifier [Axis]: AAC Holdings, Inc., Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12]     $ 0    
Ending balance [5],[13],[14] $ 0   0    
Investment, Identifier [Axis]: AAC Holdings, Inc., Preferred Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[13],[14] $ 2,080   $ 2,080    
Investment, Identifier [Axis]: AAC Holdings, Inc., Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 10.00% [13],[14]   10.00% [13],[14]   18.00% [11],[12]
PIK Rate 10.00% [13],[14],[15]   10.00% [13],[14],[15]   18.00% [11],[12],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12]     $ 209    
Ending balance [5],[13],[14] $ 280   $ 280    
Investment, Identifier [Axis]: AAC Holdings, Inc., Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.00% [13],[14],[17]   10.00% [13],[14],[17]   18.00% [11],[12]
PIK Rate 10.00% [13],[14],[15],[17]   10.00% [13],[14],[15],[17]   18.00% [11],[12],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12]     $ 5,975    
Ending balance [5],[13],[14],[17] $ 1,070   $ 1,070    
Investment, Identifier [Axis]: AAC Holdings, Inc., Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [13],[14],[17] 12.00%   12.00%    
PIK Rate [13],[14],[15],[17] 12.00%   12.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[13],[14],[17] $ 1,070   $ 1,070    
Investment, Identifier [Axis]: AAC Holdings, Inc., Warrants          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12],[18]     0    
Ending balance [5],[13],[14],[19] 0   0    
Investment, Identifier [Axis]: AGS American Glass Services Acquisition, LLC, Preferred Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20] $ 1,000   $ 1,000    
Investment, Identifier [Axis]: AGS American Glass Services Acquisition, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 9.64%   9.64%    
Spread [14],[20],[21],[22] 5.50%   5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 318   $ 318    
Investment, Identifier [Axis]: AGS American Glass Services Acquisition, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Spread [14],[20],[21],[22],[23] 5.50%   5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21],[23] $ (28)   $ (28)    
Investment, Identifier [Axis]: AGS American Glass Services Acquisition, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 9.66%   9.66%    
Spread [14],[20],[21],[22] 5.50%   5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 13,607   $ 13,607    
Investment, Identifier [Axis]: AMEREQUIP LLC., Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[25]     30    
Ending balance [5],[14],[20],[26] 4   4    
Investment, Identifier [Axis]: ATS Operating, LLC, Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     120    
Ending balance [5],[14],[20] $ 130   $ 130    
Investment, Identifier [Axis]: ATS Operating, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 10.53% [14],[20],[21],[27]   10.53% [14],[20],[21],[27]   10.85% [12],[24],[28]
Spread 6.00% [14],[20],[21],[22],[27]   6.00% [14],[20],[21],[22],[27]   6.00% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 50    
Ending balance [5],[14],[20],[21],[27] $ 225   $ 225    
Investment, Identifier [Axis]: ATS Operating, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.55% [14],[20],[21]   9.55% [14],[20],[21]   9.85% [12],[24],[28]
Spread 5.00% [14],[20],[21],[22]   5.00% [14],[20],[21],[22]   5.00% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 925    
Ending balance [5],[14],[20],[21] $ 925   $ 925    
Investment, Identifier [Axis]: ATS Operating, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 11.55% [14],[20],[21]   11.55% [14],[20],[21]   11.85% [12],[24],[28]
Spread 7.00% [14],[20],[21],[22]   7.00% [14],[20],[21],[22]   7.00% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 925    
Ending balance [5],[14],[20],[21] $ 925   925    
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC, Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[25]     124    
Ending balance [5],[14],[20],[26] $ 128   $ 128    
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 7.25% [14],[20],[21],[22],[23]   7.25% [14],[20],[21],[22],[23]   7.25% [12],[24],[28],[29],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     $ (12)    
Ending balance [5],[14],[20],[21],[23] $ (9)   $ (9)    
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.40% [14],[20],[21]   11.40% [14],[20],[21]   11.73% [12],[24],[28]
Spread 7.25% [14],[20],[21],[22]   7.25% [14],[20],[21],[22]   7.25% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 3,343    
Ending balance [5],[14],[20],[21] $ 3,279   $ 3,279    
Investment, Identifier [Axis]: Adams Publishing Group, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 11.00% [14],[20],[21],[31]   11.00% [14],[20],[21],[31]   11.00% [12],[24],[28],[32]
Spread 7.00% [14],[20],[21],[22],[31]   7.00% [14],[20],[21],[22],[31]   7.00% [12],[24],[28],[29],[32]
PIK Rate 1.00% [14],[15],[20],[21],[31]   1.00% [14],[15],[20],[21],[31]   1.00% [12],[16],[24],[28],[32]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[32]     $ 928    
Ending balance [5],[14],[20],[21],[31] $ 949   $ 949    
Investment, Identifier [Axis]: Adams Publishing Group, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.00% [14],[20],[21],[31]   11.00% [14],[20],[21],[31]   11.00% [12],[24],[28],[32]
Spread 7.00% [14],[20],[21],[22],[31]   7.00% [14],[20],[21],[22],[31]   7.00% [12],[24],[28],[29],[32]
PIK Rate 1.00% [14],[15],[20],[21],[31]   1.00% [14],[15],[20],[21],[31]   1.00% [12],[16],[24],[28],[32]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[32]     $ 2,209    
Ending balance [5],[14],[20],[21],[31] $ 2,029   2,029    
Investment, Identifier [Axis]: Airo Purchaser, Inc., Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20] $ 1,233   $ 1,233    
Investment, Identifier [Axis]: Airo Purchaser, Inc., Secured Debt 1          
Schedule of Investments [Line Items]          
Spread [14],[20],[21],[22],[23] 5.50%   5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21],[23] $ (54)   $ (54)    
Investment, Identifier [Axis]: Airo Purchaser, Inc., Secured Debt 2          
Schedule of Investments [Line Items]          
Spread [14],[20],[21],[22],[23] 5.50%   5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21],[23] $ (27)   $ (27)    
Investment, Identifier [Axis]: Airo Purchaser, Inc., Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 9.80%   9.80%    
Spread [14],[20],[21],[22] 5.50%   5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 21,996   $ 21,996    
Investment, Identifier [Axis]: American Health Staffing Group, Inc., Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 5.00% [14],[20],[21],[22],[23]   5.00% [14],[20],[21],[22],[23]   5.00% [12],[24],[28],[29],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     $ (6)    
Ending balance [5],[14],[20],[21],[23] $ (4)   $ (4)    
Investment, Identifier [Axis]: American Health Staffing Group, Inc., Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.50% [14],[20],[21]   12.50% [14],[20],[21]   12.50% [12],[24],[28]
Spread 5.00% [14],[20],[21],[22]   5.00% [14],[20],[21],[22]   5.00% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 7,703    
Ending balance [5],[14],[20],[21] $ 7,000   7,000    
Investment, Identifier [Axis]: American Nuts, LLC, Preferred Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[20] $ 1,750   $ 1,750    
Investment, Identifier [Axis]: American Nuts, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [10],[20],[21] 12.94%   12.94%    
Spread [10],[20],[21],[22] 8.50%   8.50%    
PIK Rate [10],[15],[20],[21] 12.94%   12.94%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[20],[21] $ 2,252   $ 2,252    
Investment, Identifier [Axis]: American Nuts, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [10],[20],[21] 12.94%   12.94%    
Spread [10],[20],[21],[22] 8.50%   8.50%    
PIK Rate [10],[15],[20],[21] 12.94%   12.94%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     144    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     2,252    
Gross Reductions     0    
Ending balance [5],[10],[20],[21] $ 2,252   2,252    
Investment, Identifier [Axis]: American Nuts, LLC, Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     (806)    
Amount of Interest, Fees or Dividends Credited to Income     0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     2,556    
Gross Reductions     806    
Ending balance $ 1,750   1,750    
Investment, Identifier [Axis]: American Nuts, LLC, Roaster, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28],[33]         16.49%
Spread [12],[24],[28],[29],[33]         11.75%
PIK Rate [12],[16],[24],[28],[33]         16.49%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[33]     $ 2,621    
Investment, Identifier [Axis]: American Nuts, LLC, Roaster,Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         14.49%
Spread [12],[24],[28],[29] 9.75%   9.75%    
PIK Rate [12],[16],[24],[28]         14.49%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 4,480    
Investment, Identifier [Axis]: American Nuts, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 12.94%   12.94%    
Spread 8.50%   8.50%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     144    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     2,252    
Gross Reductions     0    
Ending balance $ 2,252   2,252    
Investment, Identifier [Axis]: American Teleconferencing Services, Ltd., Secured Debt 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12],[33],[34]     59    
Investment, Identifier [Axis]: American Teleconferencing Services, Ltd., Secured Debt 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12],[33],[34]     282    
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Preferred Member Units 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10] 1,390   1,390    
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Secured Debt 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[23] $ 0   $ 0    
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [10] 14.50%   14.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10] $ 977   $ 977    
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Preferred Member Units 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9]     1,330    
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Preferred Member Units 1.1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance 0 0 0 0  
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Preferred Member Units 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9]     0    
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Preferred Member Units 2.1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     60 220  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,330 1,210  
Gross Additions     60 220  
Gross Reductions     0 0  
Ending balance 1,390 1,430 1,390 1,430  
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     0 4  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [2],[9],[30] 54  
Gross Additions     0 0  
Gross Reductions     0 54  
Ending balance $ 0 $ 0 $ 0 $ 0  
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 14.50% 13.75% 14.50% 13.75% 13.75% [9]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     127 138  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,012 [2],[9] 1,020  
Gross Additions     2 79  
Gross Reductions     37 75  
Ending balance $ 977 $ 1,024 977 1,024  
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Warrants          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [2],[9],[18] 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance 0 [5],[10],[19] 0 0 [5],[10],[19] 0  
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC,, Preferred Member Units 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10] 0   0    
Investment, Identifier [Axis]: Ansira Partners II, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread [12],[24],[28],[29],[30]         6.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     (45)    
Investment, Identifier [Axis]: Ansira Partners II, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         11.25%
Spread [12],[24],[28],[29]         6.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     17,375    
Investment, Identifier [Axis]: ArborWorks, LLC, Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     0    
Ending balance [5],[14],[20] 0   0    
Investment, Identifier [Axis]: ArborWorks, LLC, Preferred Equity 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     6,667    
Ending balance [5],[14],[20] 8,411   8,411    
Investment, Identifier [Axis]: ArborWorks, LLC, Preferred Equity 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     0    
Ending balance [5],[14],[20] $ 0   $ 0    
Investment, Identifier [Axis]: ArborWorks, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 15.00% [14],[20]   15.00% [14],[20]   15.00% [12],[24]
PIK Rate 15.00% [14],[15],[20]   15.00% [14],[15],[20]   15.00% [12],[16],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     $ 1,061    
Ending balance [5],[14],[20] $ 1,517   $ 1,517    
Investment, Identifier [Axis]: ArborWorks, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.75% [14],[20],[21]   10.75% [14],[20],[21]   11.08% [12],[24],[28]
Spread 6.50% [14],[20],[21],[22]   6.50% [14],[20],[21],[22]   6.50% [12],[24],[28],[29]
PIK Rate 10.75% [14],[15],[20],[21]   10.75% [14],[15],[20],[21]   11.08% [12],[16],[24],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 4,278    
Ending balance [5],[14],[20],[21] $ 4,645   4,645    
Investment, Identifier [Axis]: Archer Systems, LLC, Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     110    
Ending balance [5],[14],[20],[26] 110   110    
Investment, Identifier [Axis]: B-O-F Corporation, Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20] $ 180   $ 180    
Investment, Identifier [Axis]: B-O-F Corporation, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread [14],[20],[21],[22],[23] 5.75%   5.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21],[23] $ (13)   $ (13)    
Investment, Identifier [Axis]: B-O-F Corporation, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 9.04%   9.04%    
Spread [14],[20],[21],[22] 4.75%   4.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 2,976   $ 2,976    
Investment, Identifier [Axis]: B-O-F Corporation, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 11.04%   11.04%    
Spread [14],[20],[21],[22] 6.75%   6.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 2,976   $ 2,976    
Investment, Identifier [Axis]: BDB Holdings, LLC, , Preferred Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[8] 10,699   10,699    
Investment, Identifier [Axis]: BDB Holdings, LLC, Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     (1,910)    
Amount of Interest, Fees or Dividends Credited to Income     0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[7]     12,610    
Gross Additions     0    
Gross Reductions     1,911    
Ending balance $ 10,699   $ 10,699    
Investment, Identifier [Axis]: BDB Holdings, LLC, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate [8] 12.00%   12.00%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     24    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     782    
Gross Reductions     0    
Ending balance [5],[8] $ 782   782    
Investment, Identifier [Axis]: BP Loenbro Holdings Inc., Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     1,550    
Ending balance [5],[14],[20] $ 2,830   $ 2,830    
Investment, Identifier [Axis]: BP Loenbro Holdings Inc., Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 10.01% [14],[20],[21],[27]   10.01% [14],[20],[21],[27]   10.68% [12],[24],[28],[35]
Spread 5.75% [14],[20],[21],[22],[27]   5.75% [14],[20],[21],[22],[27]   6.25% [12],[24],[28],[29],[35]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[35]     $ 514    
Ending balance [5],[14],[20],[21],[27] $ 385   $ 385    
Investment, Identifier [Axis]: BP Loenbro Holdings Inc., Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 10.14%   10.14%    
Spread 5.75% [14],[20],[21],[22]   5.75% [14],[20],[21],[22]   6.25% [12],[24],[28],[29],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     $ (10)    
Ending balance [5],[14],[20],[21] $ 1,279   $ 1,279    
Investment, Identifier [Axis]: BP Loenbro Holdings Inc., Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 10.17% [14],[20],[21]   10.17% [14],[20],[21]   10.92% [12],[24],[28]
Spread 5.75% [14],[20],[21],[22]   5.75% [14],[20],[21],[22]   6.25% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 11,217    
Ending balance [5],[14],[20],[21] $ 11,003   $ 11,003    
Investment, Identifier [Axis]: BP Loenbro Holdings Inc., Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 10.14%   10.14%    
Spread [14],[20],[21],[22] 5.75%   5.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 0   $ 0    
Investment, Identifier [Axis]: BP Loenbro Holdings Inc., Secured Debt 5          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 10.14%   10.14%    
Spread [14],[20],[21],[22] 5.75%   5.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 4,219   $ 4,219    
Investment, Identifier [Axis]: Barfly Ventures, LLC, Member Units          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     317 407  
Amount of Interest, Fees or Dividends Credited to Income     368 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,953 [2],[9],[24] 1,380  
Gross Additions     317 407  
Gross Reductions     0 0  
Ending balance 2,270 [5],[10],[20],[26] 1,787 2,270 [5],[10],[20],[26] 1,787  
Investment, Identifier [Axis]: Batjer TopCo, LLC, Preferred Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[26] 970   970    
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[23] 0   0    
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[23] $ 0   $ 0    
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [10] 10.00%   10.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10] $ 1,099   $ 1,099    
Investment, Identifier [Axis]: Batjer TopCo, LLC, Preferred Stock          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     400 (110)  
Amount of Interest, Fees or Dividends Credited to Income     65 71  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     570 [2],[9],[25] 680  
Gross Additions     400 0  
Gross Reductions     0 110  
Ending balance 970 $ 570 970 $ 570  
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate   10.00%   10.00% 10.00% [9]
Amount of Realized Gain/(Loss)     0 $ 0  
Amount of Unrealized Gain/(Loss)     0 (1)  
Amount of Interest, Fees or Dividends Credited to Income     1 3  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     50 [2],[9] 0  
Gross Additions     0 50  
Gross Reductions     50 1  
Ending balance 0 $ 49 0 $ 49  
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate   10.00%   10.00% 10.00% [9]
Amount of Realized Gain/(Loss)     0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     2 2  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     30 [2],[9] 30  
Gross Additions     0 0  
Gross Reductions     30 0  
Ending balance $ 0 $ 30 $ 0 $ 30  
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 10.00% 10.00% 10.00% 10.00% 10.00% [9]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 (15)  
Amount of Interest, Fees or Dividends Credited to Income     95 93  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,165 [2],[9] 1,175  
Gross Additions     4 4  
Gross Reductions     70 15  
Ending balance $ 1,099 $ 1,164 1,099 1,164  
Investment, Identifier [Axis]: Berry Aviation, Inc., Preferred Member Units 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     0    
Ending balance [5],[14],[20],[36] 0   0    
Investment, Identifier [Axis]: Berry Aviation, Inc., Preferred Member Units 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[37]     0    
Ending balance [5],[14],[20],[36] 0   0    
Investment, Identifier [Axis]: Berry Aviation, Inc., Preferred Member Units 3          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[37]     0    
Ending balance [5],[14],[20],[36] $ 0   $ 0    
Investment, Identifier [Axis]: Bettercloud, Inc., Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [14],[17],[20],[21] 14.56%   14.56%    
Spread 10.25% [14],[17],[20],[21],[22]   10.25% [14],[17],[20],[21],[22]   10.25% [12],[24],[28],[29],[30]
PIK Rate [14],[15],[17],[20],[21] 7.25%   7.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     $ (14)    
Ending balance [5],[14],[17],[20],[21] $ 23   $ 23    
Investment, Identifier [Axis]: Bettercloud, Inc., Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 14.56% [14],[17],[20],[21],[38]   14.56% [14],[17],[20],[21],[38]   15.76% [12],[24],[28]
Spread 10.25% [14],[17],[20],[21],[22],[38]   10.25% [14],[17],[20],[21],[22],[38]   10.25% [12],[24],[28],[29]
PIK Rate 7.25% [14],[15],[17],[20],[21],[38]   7.25% [14],[15],[17],[20],[21],[38]   9.25% [12],[16],[24],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 6,963    
Ending balance [5],[14],[17],[20],[21],[38] $ 171   $ 171    
Investment, Identifier [Axis]: Bettercloud, Inc., Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [14],[17],[20],[21] 14.58%   14.58%    
Spread [14],[17],[20],[21],[22] 10.25%   10.25%    
PIK Rate [14],[15],[17],[20],[21] 7.25%   7.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[17],[20],[21] $ 1,472   $ 1,472    
Investment, Identifier [Axis]: Bettercloud, Inc., Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate [14],[17],[20],[21],[38] 14.58%   14.58%    
Spread [14],[17],[20],[21],[22],[38] 10.25%   10.25%    
PIK Rate [14],[15],[17],[20],[21],[38] 7.25%   7.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[17],[20],[21],[38] $ 4,674   $ 4,674    
Investment, Identifier [Axis]: Binswanger Enterprises, LLC, Member Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     650    
Ending balance [5],[14],[20] 1,060   1,060    
Investment, Identifier [Axis]: Bluestem Brands, Inc., Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12]     0    
Ending balance [5],[13],[14] $ 0   $ 0    
Investment, Identifier [Axis]: Bluestem Brands, Inc., Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 12.89% [13],[14],[17],[21]   12.89% [13],[14],[17],[21]   13.17% [11],[12],[28]
Spread 8.50% [13],[14],[17],[21],[22]   8.50% [13],[14],[17],[21],[22]   8.50% [11],[12],[28],[29]
PIK Rate 11.89% [13],[14],[15],[17],[21]   11.89% [13],[14],[15],[17],[21]   12.17% [11],[12],[16],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12],[28]     $ 181    
Ending balance [5],[13],[14],[17],[21] $ 59   $ 59    
Investment, Identifier [Axis]: Bluestem Brands, Inc., Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 15.00% [13],[14],[17],[21]   15.00% [13],[14],[17],[21]   15.00% [11],[12],[28]
Spread 7.50% [13],[14],[17],[21],[22]   7.50% [13],[14],[17],[21],[22]   7.50% [11],[12],[28],[29]
PIK Rate 14.75% [13],[14],[15],[17],[21]   14.75% [13],[14],[15],[17],[21]   14.75% [11],[12],[16],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12],[28]     $ 2,792    
Ending balance [5],[13],[14],[17],[21] $ 905   $ 905    
Investment, Identifier [Axis]: Bluestem Brands, Inc., Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 12.89% [13],[14],[17],[21]   12.89% [13],[14],[17],[21]   13.17% [11],[12],[28]
Spread 8.50% [13],[14],[17],[21],[22]   8.50% [13],[14],[17],[21],[22]   8.50% [11],[12],[28],[29]
PIK Rate 12.89% [13],[14],[15],[17],[21]   12.89% [13],[14],[15],[17],[21]   12.17% [11],[12],[16],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12],[28]     $ 3,790    
Ending balance [5],[13],[14],[17],[21] $ 1,203   1,203    
Investment, Identifier [Axis]: Bluestem Brands, Inc., Warrants          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12],[18]     0    
Ending balance [5],[13],[14],[19] 0   0    
Investment, Identifier [Axis]: Boccella Precast Products LLC, Member Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     80    
Ending balance [5],[14],[26] $ 460   $ 460    
Investment, Identifier [Axis]: Boccella Precast Products LLC, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 10.00% [14]   10.00% [14]   10.00% [12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     $ 66    
Ending balance [5],[14] $ 64   64    
Investment, Identifier [Axis]: Bond Brand Loyalty ULC, Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[39],[40]     0    
Ending balance [5],[14],[20],[41],[42] 0   0    
Investment, Identifier [Axis]: Bond Brand Loyalty ULC, Preferred Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[39],[40]     310    
Ending balance [5],[14],[20],[41],[42] $ 350   $ 350    
Investment, Identifier [Axis]: Bond Brand Loyalty ULC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 11.44% [14],[20],[21],[41],[42]   11.44% [14],[20],[21],[41],[42]   11.65% [12],[24],[28],[39],[40]
Spread 7.00% [14],[20],[21],[22],[41],[42]   7.00% [14],[20],[21],[22],[41],[42]   7.00% [12],[24],[28],[29],[39],[40]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[39],[40]     $ 360    
Ending balance [5],[14],[20],[21],[41],[42] $ 360   $ 360    
Investment, Identifier [Axis]: Bond Brand Loyalty ULC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.44% [14],[20],[21],[41],[42]   10.44% [14],[20],[21],[41],[42]   10.74% [12],[24],[28],[39],[40]
Spread 6.00% [14],[20],[21],[22],[41],[42]   6.00% [14],[20],[21],[22],[41],[42]   6.00% [12],[24],[28],[29],[39],[40]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[39],[40]     $ 3,999    
Ending balance [5],[14],[20],[21],[41],[42] $ 3,969   $ 3,969    
Investment, Identifier [Axis]: Bond Brand Loyalty ULC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 12.44% [14],[20],[21],[41],[42]   12.44% [14],[20],[21],[41],[42]   12.74% [12],[24],[28],[39],[40]
Spread 8.00% [14],[20],[21],[22],[41],[42]   8.00% [14],[20],[21],[22],[41],[42]   8.00% [12],[24],[28],[29],[39],[40]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[39],[40]     $ 3,999    
Ending balance [5],[14],[20],[21],[41],[42] $ 3,969   3,969    
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Preferred Member Units 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[26] 850   850    
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Preferred Member Units 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[26] $ 81   $ 81    
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate [10],[21] 14.41%   14.41%    
Spread [10],[21],[22] 10.00%   10.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[21] $ 1,254   $ 1,254    
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Preferred Member Units          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       (40)  
Amount of Interest, Fees or Dividends Credited to Income       23  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       1,400  
Gross Additions       0  
Gross Reductions       40  
Ending balance   $ 1,360   $ 1,360  
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Preferred Member Units 1.1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     (320)    
Amount of Interest, Fees or Dividends Credited to Income     23    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,170    
Gross Additions     0    
Gross Reductions     320    
Ending balance 850   850    
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Preferred Member Units 2.1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     81    
Gross Reductions     0    
Ending balance $ 81   81    
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Provider of Crane Rental and Operating Services, Preferred Member Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9],[25]     1,170    
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Provider of Crane Rental and Operating Services, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate [9],[28]         14.66%
Spread [9],[28],[29]         10.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9],[28]     $ 1,254    
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 14.41% 15.35% 14.41% 15.35%  
Spread 10.00% 10.00% 10.00% 10.00%  
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     137 158  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,254 1,374  
Gross Additions     0 4  
Gross Reductions     0 93  
Ending balance $ 1,254 $ 1,285 1,254 1,285  
Investment, Identifier [Axis]: Brightwood Capital Fund Investments, LP Interests (Brightwood Capital Fund III, LP)          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[39],[43],[44]     1,039    
Ending balance [5],[14],[41],[45],[46] 930   930    
Investment, Identifier [Axis]: Brightwood Capital Fund Investments, LP Interests (Brightwood Capital Fund IV, LP)          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[39],[43],[44]     8,031    
Ending balance [5],[14],[26],[41],[45],[46] $ 6,968   $ 6,968    
Investment, Identifier [Axis]: Buca C, LLC, Preferred Member Units          
Schedule of Investments [Line Items]          
Total Rate 6.00% [14]   6.00% [14]   6.00% [12]
PIK Rate 6.00% [14],[15]   6.00% [14],[15]   6.00% [12],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     $ 0    
Ending balance [5],[14] $ 0   $ 0    
Investment, Identifier [Axis]: Buca C, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 15.00% [14],[17],[47]   15.00% [14],[17],[47]   15.00% [12],[33],[34]
PIK Rate 15.00% [14],[15],[17],[47]   15.00% [14],[15],[17],[47]   15.00% [12],[16],[33],[34]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[33],[34]     $ 0    
Ending balance [5],[14],[17],[47] $ 0   $ 0    
Investment, Identifier [Axis]: Buca C, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 15.00% [14],[17],[47]   15.00% [14],[17],[47]   15.00% [12],[33]
PIK Rate 15.00% [14],[15],[17],[47]   15.00% [14],[15],[17],[47]   15.00% [12],[16],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[33]     $ 0    
Ending balance [5],[14],[17],[47] $ 0   $ 0    
Investment, Identifier [Axis]: Buca C, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 15.00% [14],[17],[47]   15.00% [14],[17],[47]   15.00% [12],[33],[34]
PIK Rate 15.00% [14],[15],[17],[47]   15.00% [14],[15],[17],[47]   15.00% [12],[16],[33],[34]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[33],[34]     $ 0    
Ending balance [5],[14],[17],[47] $ 0   $ 0    
Investment, Identifier [Axis]: Burning Glass Intermediate Holding Company, Inc., Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 9.43%   9.43%    
Spread 5.00% [14],[20],[21],[22]   5.00% [14],[20],[21],[22]   5.00% [12],[24],[28],[29],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     $ 0    
Ending balance [5],[14],[20],[21] $ 1,136   $ 1,136    
Investment, Identifier [Axis]: Burning Glass Intermediate Holding Company, Inc., Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.15% [14],[20],[21]   9.15% [14],[20],[21]   9.46% [12],[24],[28]
Spread 5.00% [14],[20],[21],[22]   5.00% [14],[20],[21],[22]   5.00% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 11,575    
Ending balance [5],[14],[20],[21] $ 10,955   10,955    
Investment, Identifier [Axis]: CAI Software LLC, Preferred Equity 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     513    
Investment, Identifier [Axis]: CAI Software LLC, Preferred Equity 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     $ 0    
Investment, Identifier [Axis]: CQ Fluency, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 6.75% [14],[20],[21],[22],[23]   6.75% [14],[20],[21],[22],[23]   6.75% [12],[24],[28],[29],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     $ (31)    
Ending balance [5],[14],[20],[21],[23] $ (22)   $ (22)    
Investment, Identifier [Axis]: CQ Fluency, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 10.85%   10.85%    
Spread 6.75% [14],[20],[21],[22]   6.75% [14],[20],[21],[22]   6.75% [12],[24],[28],[29],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     $ (31)    
Ending balance [5],[14],[20],[21] $ 6,938   6,938    
Investment, Identifier [Axis]: CQ Fluency, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         11.18%
Spread [12],[24],[28],[29]         6.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     7,169    
Investment, Identifier [Axis]: Career Team Holdings, LLC, Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     530    
Ending balance [5],[14] $ 600   $ 600    
Investment, Identifier [Axis]: Career Team Holdings, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [12],[28]         10.56%
Spread 6.00% [14],[21],[22],[23]   6.00% [14],[21],[22],[23]   6.00% [12],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[28]     $ 97    
Ending balance [5],[14],[21],[23] $ (6)   $ (6)    
Investment, Identifier [Axis]: Career Team Holdings, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 13.00% [14]   13.00% [14]   12.50% [12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     $ 2,134    
Ending balance [5],[14] $ 2,376   2,376    
Investment, Identifier [Axis]: CaseWorthy, Inc., Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     160    
Ending balance [5],[14],[20] 210   210    
Investment, Identifier [Axis]: CenterPeak Holdings, LLC, Preferred Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[25]     1,610    
Ending balance [5],[14],[26] $ 2,610   $ 2,610    
Investment, Identifier [Axis]: CenterPeak Holdings, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [14] 15.00%   15.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[30]     $ 0    
Ending balance [5],[14] $ 200   $ 200    
Investment, Identifier [Axis]: CenterPeak Holdings, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 15.00% [14]   15.00% [14]   15.00% [12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     $ 2,390    
Ending balance [5],[14] $ 2,390   2,390    
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Preferred Member Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9]     3,110    
Ending balance [5],[10] $ 5,310   5,310    
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [9],[28]         13.66%
Spread [9],[28],[29]         9.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9],[28]     $ 6,384    
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Preferred Member Units          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       230  
Amount of Interest, Fees or Dividends Credited to Income       23  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       2,760  
Gross Additions       230  
Gross Reductions       0  
Ending balance   $ 2,990   $ 2,990  
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 8.00% [10],[21],[22],[23] 10.00% 8.00% [10],[21],[22],[23] 10.00% 6.00% [9],[28],[29],[30]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     2 2  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [2],[9],[28],[30] 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance $ 0 [5],[10],[21],[23] $ 0 $ 0 [5],[10],[21],[23] $ 0  
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.41% [10],[21] 15.35% 12.41% [10],[21] 15.35% 12.74% [9],[28]
Spread 8.00% [10],[21],[22] 10.00% 8.00% [10],[21],[22] 10.00% 8.00% [9],[28],[29]
Amount of Realized Gain/(Loss)       $ 0  
Amount of Unrealized Gain/(Loss)       54  
Amount of Interest, Fees or Dividends Credited to Income       550  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     $ 3,905 [2],[9],[28] 0  
Gross Additions       5,494  
Gross Reductions       378  
Ending balance $ 6,116 [5],[10],[21] $ 5,116 $ 6,116 [5],[10],[21] 5,116  
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt 2.1          
Schedule of Investments [Line Items]          
Total Rate 12.41%   12.41%    
Spread 8.00%   8.00%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     (8)    
Amount of Interest, Fees or Dividends Credited to Income     659    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     6,384    
Gross Additions     8    
Gross Reductions     276    
Ending balance $ 6,116   6,116    
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     2,200 (29)  
Amount of Interest, Fees or Dividends Credited to Income     23 84  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     3,110 4,394  
Gross Additions     2,200 0  
Gross Reductions     0 4,394  
Ending balance 5,310 0 5,310 0  
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC,Secured Debt 1          
Schedule of Investments [Line Items]          
Spread [9],[28],[29],[30]         9.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9],[28],[30]     0    
Investment, Identifier [Axis]: Chamberlin Holding LLC, Member Units 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[26] 8,270   8,270    
Investment, Identifier [Axis]: Chamberlin Holding LLC, Member Units 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[26],[36] $ 943   $ 943    
Investment, Identifier [Axis]: Chamberlin Holding LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread [10],[21],[22],[23] 6.00%   6.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[21],[23] $ 0   $ 0    
Investment, Identifier [Axis]: Chamberlin Holding LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [10],[21] 12.49%   12.49%    
Spread [10],[21],[22] 8.00%   8.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[21] $ 5,105   $ 5,105    
Investment, Identifier [Axis]: Chamberlin Holding LLC, Member Units 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     (10) 300  
Amount of Interest, Fees or Dividends Credited to Income     1,471 969  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     8,280 [2],[9],[25] 7,330  
Gross Additions     0 300  
Gross Reductions     10 0  
Ending balance 8,270 7,630 8,270 7,630  
Investment, Identifier [Axis]: Chamberlin Holding LLC, Member Units 2          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     55 90  
Amount of Interest, Fees or Dividends Credited to Income     17 17  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     888 [2],[9],[25],[37] 715  
Gross Additions     55 90  
Gross Reductions     0 0  
Ending balance $ 943 $ 805 $ 943 $ 805  
Investment, Identifier [Axis]: Chamberlin Holding LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 6.00% 6.00% 6.00% 6.00%  
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (17) (17)  
Amount of Interest, Fees or Dividends Credited to Income     18 18  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 0  
Gross Additions     17 17  
Gross Reductions     17 17  
Ending balance $ 0 $ 0 $ 0 $ 0  
Investment, Identifier [Axis]: Chamberlin Holding LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.49% 13.36% 12.49% 13.36%  
Spread 8.00% 8.00% 8.00% 8.00%  
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     3 (1)  
Amount of Interest, Fees or Dividends Credited to Income     419 401  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     3,905 3,905  
Gross Additions     1,200 1  
Gross Reductions     0 1  
Ending balance $ 5,105 $ 3,905 $ 5,105 3,905  
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 11.20% [14],[20],[21],[27]   11.20% [14],[20],[21],[27]   11.53% [12],[24],[28],[35]
Spread 6.75% [14],[20],[21],[22],[27]   6.75% [14],[20],[21],[22],[27]   7.00% [12],[24],[28],[29],[35]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[35]     $ 444    
Ending balance [5],[14],[20],[21],[27] $ 514   $ 514    
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.23% [14],[20],[21]   11.23% [14],[20],[21]   11.93% [12],[24],[28]
Spread 6.75% [14],[20],[21],[22]   6.75% [14],[20],[21],[22]   7.00% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 3,166    
Ending balance [5],[14],[20],[21] $ 3,300   $ 3,300    
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 11.23% [14],[20],[21]   11.23% [14],[20],[21]   11.93% [12],[24],[28]
Spread 6.75% [14],[20],[21],[22]   6.75% [14],[20],[21],[22]   7.00% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 175    
Ending balance [5],[14],[20],[21] $ 183   $ 183    
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC, Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 11.23% [14],[20],[21]   11.23% [14],[20],[21]   11.93% [12],[24],[28]
Spread 6.75% [14],[20],[21],[22]   6.75% [14],[20],[21],[22]   7.00% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 424    
Ending balance [5],[14],[20],[21] $ 442   442    
Investment, Identifier [Axis]: Charps, LLC, Preferred Member Units          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     (80) (20)  
Amount of Interest, Fees or Dividends Credited to Income     134 121  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     3,900 [2],[9],[25] 3,920  
Gross Additions     0 0  
Gross Reductions     80 20  
Ending balance 3,820 [5],[10],[26] 3,900 3,820 [5],[10],[26] 3,900  
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Member Units 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[26] 3,530   3,530    
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[23] $ 0   $ 0    
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [10] 10.00%   10.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10] $ 235   $ 235    
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Member Units 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     780 910  
Amount of Interest, Fees or Dividends Credited to Income     289 146  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     2,750 [2],[9],[25] 1,300  
Gross Additions     780 910  
Gross Reductions     0 0  
Ending balance 3,530 2,210 3,530 2,210  
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Member Units 2          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       (45)  
Amount of Interest, Fees or Dividends Credited to Income       0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     237 [2],[9],[37] 282  
Gross Additions       0  
Gross Reductions       45  
Ending balance   237   237  
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Member Units 2.1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     80    
Amount of Interest, Fees or Dividends Credited to Income     0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     236    
Gross Additions     81    
Gross Reductions     0    
Ending balance 317   317    
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9],[30]     0    
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 1.1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     0 1  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance 0 $ 0 0 $ 0  
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [9]         9.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9]     1,690    
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 2.1          
Schedule of Investments [Line Items]          
Total Rate   10.00%   10.00%  
Amount of Realized Gain/(Loss)     0 $ 0  
Amount of Unrealized Gain/(Loss)     (9) 37  
Amount of Interest, Fees or Dividends Credited to Income     98 176  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,690 2,103  
Gross Additions     0 30  
Gross Reductions     1,690 350  
Ending balance $ 0 $ 1,783 $ 0 $ 1,783  
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 10.00% 10.00% 10.00% 10.00% 10.00% [9]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     18 19  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     243 [2],[9] 251  
Gross Additions     0 0  
Gross Reductions     8 7  
Ending balance $ 235 $ 244 $ 235 244  
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 3.1          
Schedule of Investments [Line Items]          
Total Rate 10.00%   10.00%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     24    
Amount of Interest, Fees or Dividends Credited to Income     45    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     2,450    
Gross Reductions     40    
Ending balance $ 2,410   2,410    
Investment, Identifier [Axis]: Clad-Rex Steel, LLC,, Member Units 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[36] $ 317   $ 317    
Investment, Identifier [Axis]: Clad-Rex Steel, LLC,, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [10] 10.00%   10.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10] $ 2,410   $ 2,410    
Investment, Identifier [Axis]: Clarius BIGS, LLC, Secured Debt          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[33],[34]     19    
Ending balance [5],[14],[17],[20],[47] 11   11    
Investment, Identifier [Axis]: Classic H&G Holdings, LLC, Preferred Member Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[25]     710    
Ending balance [5],[14] 490   490    
Investment, Identifier [Axis]: Cody Pools, Inc., Preferred Member Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[26],[36] 16,620   16,620    
Investment, Identifier [Axis]: Cody Pools, Inc., Preferred Member Units          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     (330) (630)  
Amount of Interest, Fees or Dividends Credited to Income     428 392  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     16,950 [2],[9],[25],[37] 18,120  
Gross Additions     0 0  
Gross Reductions     330 630  
Ending balance 16,620 17,490 16,620 17,490  
Investment, Identifier [Axis]: Cody Pools, Inc., Secured Debt 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     5 1  
Amount of Interest, Fees or Dividends Credited to Income     37 6  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [2],[9],[30] 0  
Gross Additions     157 236  
Gross Reductions     157 236  
Ending balance $ 0 [5],[10],[23] $ 0 $ 0 [5],[10],[23] $ 0  
Investment, Identifier [Axis]: Cody Pools, Inc., Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.50% [10] 12.50% 12.50% [10] 12.50% 12.50% [9]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     6 (6)  
Amount of Interest, Fees or Dividends Credited to Income     604 660  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     6,598 [2],[9] 7,111  
Gross Additions     629 5  
Gross Reductions     500 404  
Ending balance $ 6,727 [5],[10] $ 6,712 6,727 [5],[10] 6,712  
Investment, Identifier [Axis]: Colonial Electric Company LLC, Secured Debt 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[23] $ 0   $ 0    
Investment, Identifier [Axis]: Colonial Electric Company LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [10] 12.00%   12.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10] $ 2,195   $ 2,195    
Investment, Identifier [Axis]: Colonial Electric Company LLC, Preferred Member Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[26] 3,610   3,610    
Investment, Identifier [Axis]: Colonial Electric Company LLC, Preferred Member Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9],[25]     3,390    
Investment, Identifier [Axis]: Colonial Electric Company LLC, Preferred Member Units 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     220 (360)  
Amount of Interest, Fees or Dividends Credited to Income     818 360  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     3,390 600  
Gross Additions     220 0  
Gross Reductions     0 600  
Ending balance 3,610 0 3,610 0  
Investment, Identifier [Axis]: Colonial Electric Company LLC, Preferred Member Units 2          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       1,360  
Amount of Interest, Fees or Dividends Credited to Income       560  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       1,920  
Gross Additions       1,360  
Gross Reductions       0  
Ending balance   3,280   3,280  
Investment, Identifier [Axis]: Colonial Electric Company LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     2 2  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [2],[9],[30] 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance $ 0 $ 0 $ 0 $ 0  
Investment, Identifier [Axis]: Colonial Electric Company LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.00% 12.00% 12.00% 12.00% 12.00% [9]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (18) 73  
Amount of Interest, Fees or Dividends Credited to Income     293 469  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     3,578 [2],[9] 5,407  
Gross Additions     18 105  
Gross Reductions     1,401 1,456  
Ending balance $ 2,195 $ 4,056 2,195 4,056  
Investment, Identifier [Axis]: Compass Systems & Sales, LLC, Secured Debt 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[23] $ (13)   $ (13)    
Investment, Identifier [Axis]: Compass Systems & Sales, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [10] 13.50%   13.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10] $ 4,244   $ 4,244    
Investment, Identifier [Axis]: Compass Systems & Sales, LLC, Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     (60) 117  
Amount of Interest, Fees or Dividends Credited to Income     45 45  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,860 [2],[9] 1,863  
Gross Additions     0 117  
Gross Reductions     60 0  
Ending balance 1,800 [5],[10] 1,980 1,800 [5],[10] 1,980  
Investment, Identifier [Axis]: Compass Systems & Sales, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     3 18  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     (16) [2],[9],[30] 0  
Gross Additions     3 583  
Gross Reductions     0 600  
Ending balance $ (13) $ (17) $ (13) $ (17)  
Investment, Identifier [Axis]: Compass Systems & Sales, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 13.50% 13.50% 13.50% 13.50% 13.50% [9]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     23 0  
Amount of Interest, Fees or Dividends Credited to Income     459 461  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     4,201 [2],[9] 4,175  
Gross Additions     43 19  
Gross Reductions     0 0  
Ending balance $ 4,244 $ 4,194 $ 4,244 4,194  
Investment, Identifier [Axis]: Computer Data Source, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 12.61% [14],[20],[21],[27]   12.61% [14],[20],[21],[27]   12.93% [12],[24],[28],[35]
Spread 8.25% [14],[20],[21],[22],[27]   8.25% [14],[20],[21],[22],[27]   8.25% [12],[24],[28],[29],[35]
PIK Rate [14],[15],[20],[21],[27] 12.61%   12.61%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[35]     $ 6,118    
Ending balance [5],[14],[20],[21],[27] $ 6,572   $ 6,572    
Investment, Identifier [Axis]: Computer Data Source, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 12.64%   12.64%    
Spread 8.25% [14],[20],[21],[22]   8.25% [14],[20],[21],[22]   8.25% [12],[24],[28],[29],[30]
PIK Rate [14],[15],[20],[21] 12.64%   12.64%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     $ (42)    
Ending balance [5],[14],[20],[21] $ 15,987   15,987    
Investment, Identifier [Axis]: Computer Data Source, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         12.92%
Spread [12],[24],[28],[29]         8.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     14,807    
Investment, Identifier [Axis]: Connect Telecommunications Solutions Holdings, Inc., Preferred Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[39]     1,400    
Ending balance [5],[14],[41],[42] $ 1,400   $ 1,400    
Investment, Identifier [Axis]: Connect Telecommunications Solutions Holdings, Inc., Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 13.00% [14],[41],[42]   13.00% [14],[41],[42]   13.00% [12],[39]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[39]     $ 2,977    
Ending balance [5],[14],[41],[42] $ 2,716   2,716    
Investment, Identifier [Axis]: Copper Trail Fund Investments, LP Interests (CTMH, LP)          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     530 [2],[7],[39],[43],[44] 568  
Gross Additions     0 0  
Gross Reductions     15 38  
Ending balance 515 [5],[8],[41],[45],[46] 530 515 [5],[8],[41],[45],[46] 530  
Investment, Identifier [Axis]: Core Transformers, Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 1,000   $ 1,000    
Investment, Identifier [Axis]: Core Transformers, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread [14],[20],[21],[22],[23] 5.50%   5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21],[23] $ (99)   $ (99)    
Investment, Identifier [Axis]: Core Transformers, Secured Debt 2          
Schedule of Investments [Line Items]          
Spread [14],[20],[21],[22],[23] 5.50%   5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21],[23] $ (99)   $ (99)    
Investment, Identifier [Axis]: Core Transformers, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 9.66%   9.66%    
Spread [14],[20],[21],[22] 5.50%   5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 9,803   $ 9,803    
Investment, Identifier [Axis]: Coregistics Buyer LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 10.70% [14],[20],[21],[27],[41],[42]   10.70% [14],[20],[21],[27],[41],[42]   10.39% [12],[24],[28],[39],[40]
Spread 6.50% [14],[20],[21],[22],[27],[41],[42]   6.50% [14],[20],[21],[22],[27],[41],[42]   6.00% [12],[24],[28],[29],[39],[40]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[39],[40]     $ 440    
Ending balance [5],[14],[20],[21],[27],[41],[42] $ 449   $ 449    
Investment, Identifier [Axis]: Coregistics Buyer LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.81% [14],[20],[21],[41],[42]   10.81% [14],[20],[21],[41],[42]   10.36% [12],[24],[28],[39],[40]
Spread 6.50% [14],[20],[21],[22],[41],[42]   6.50% [14],[20],[21],[22],[41],[42]   6.00% [12],[24],[28],[29],[39],[40]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[39],[40]     $ 2,824    
Ending balance [5],[14],[20],[21],[41],[42] $ 2,849   $ 2,849    
Investment, Identifier [Axis]: Coregistics Buyer LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 10.69% [14],[20],[21],[41],[42]   10.69% [14],[20],[21],[41],[42]   10.40% [12],[24],[28],[39],[40]
Spread 6.50% [14],[20],[21],[22],[41],[42]   6.50% [14],[20],[21],[22],[41],[42]   6.00% [12],[24],[28],[29],[39],[40]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[39],[40]     $ 1,878    
Ending balance [5],[14],[20],[21],[41],[42] $ 1,899   $ 1,899    
Investment, Identifier [Axis]: Coregistics Buyer LLC, Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 11.06% [14],[20],[21],[41],[42]   11.06% [14],[20],[21],[41],[42]   10.61% [12],[24],[28],[39],[40]
Spread 6.75% [14],[20],[21],[22],[41],[42]   6.75% [14],[20],[21],[22],[41],[42]   6.25% [12],[24],[28],[29],[39],[40]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[39],[40]     $ 8,109    
Ending balance [5],[14],[20],[21],[41],[42] $ 8,404   8,404    
Investment, Identifier [Axis]: Creative Foam Corporation, Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20] $ 250   $ 250    
Investment, Identifier [Axis]: Creative Foam Corporation, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 6.50% [14],[20],[21],[22],[23]   6.50% [14],[20],[21],[22],[23]   5.75% [12],[24],[28],[29],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     $ (28)    
Ending balance [5],[14],[20],[21],[23] $ (23)   $ (23)    
Investment, Identifier [Axis]: Creative Foam Corporation, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.50% [14],[20],[21]   10.50% [14],[20],[21]   10.11% [12],[24],[28]
Spread 6.50% [14],[20],[21],[22]   6.50% [14],[20],[21],[22]   5.75% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 10,694    
Ending balance [5],[14],[20],[21] $ 10,596   $ 10,596    
Investment, Identifier [Axis]: Creative Foam Corporation, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 10.79%   10.79%    
Spread [14],[20],[21],[22] 6.50%   6.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 16,891   $ 16,891    
Investment, Identifier [Axis]: DMA Industries, LLC, Preferred Equity 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     620    
Amount of Interest, Fees or Dividends Credited to Income     0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9]     1,486    
Gross Additions     620    
Gross Reductions     0    
Ending balance $ 2,106   $ 2,106    
Investment, Identifier [Axis]: DMA Industries, LLC, Preferred Equity 2          
Schedule of Investments [Line Items]          
Total Rate 15.00%   15.00%   15.00% [9],[25]
PIK Rate 15.00%   15.00%   15.00% [9],[16],[25]
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     320    
Amount of Interest, Fees or Dividends Credited to Income     94    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9],[25]     810    
Gross Additions     414    
Gross Reductions     0    
Ending balance $ 1,224   $ 1,224    
Investment, Identifier [Axis]: DMA Industries, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 12.00%   12.00%   12.00% [9]
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     2    
Amount of Interest, Fees or Dividends Credited to Income     13    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9]     138    
Gross Additions     2    
Gross Reductions     0    
Ending balance $ 140   $ 140    
Investment, Identifier [Axis]: DMA Industries, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.00%   12.00%   12.00% [9]
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     28    
Amount of Interest, Fees or Dividends Credited to Income     384    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9]     4,161    
Gross Additions     39    
Gross Reductions     600    
Ending balance $ 3,600   3,600    
Investment, Identifier [Axis]: DMA Industries, LLC. Preferred Equity 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10] $ 2,106   $ 2,106    
Investment, Identifier [Axis]: DMA Industries, LLC. Preferred Equity 2          
Schedule of Investments [Line Items]          
Total Rate [10],[26] 15.00%   15.00%    
PIK Rate [10],[15],[26] 15.00%   15.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[26] $ 1,224   $ 1,224    
Investment, Identifier [Axis]: DMA Industries, LLC. Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [10] 12.00%   12.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10] $ 3,600   $ 3,600    
Investment, Identifier [Axis]: DMA Industries, LLC., Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [10] 12.00%   12.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10] $ 140   $ 140    
Investment, Identifier [Axis]: DTE Enterprises, LLC, Class A Preferred Member Units          
Schedule of Investments [Line Items]          
Total Rate 8.00% [14],[20]   8.00% [14],[20]   8.00% [12],[24]
PIK Rate 8.00% [14],[15],[20]   8.00% [14],[15],[20]   8.00% [12],[16],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     $ 0    
Ending balance [5],[14],[20] $ 0   $ 0    
Investment, Identifier [Axis]: DTE Enterprises, LLC, Class AA Preferred Member Units (non-voting)          
Schedule of Investments [Line Items]          
Total Rate 10.00% [14],[20]   10.00% [14],[20]   10.00% [12],[24],[25]
PIK Rate 10.00% [14],[15],[20]   10.00% [14],[15],[20]   10.00% [12],[16],[24],[25]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[25]     $ 438    
Ending balance [5],[14],[20] $ 0   0    
Investment, Identifier [Axis]: Dalton US Inc., Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     50    
Ending balance [5],[14],[20] 50   50    
Investment, Identifier [Axis]: Datacom, LLC, Preferred Member Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10] $ 0   $ 0    
Investment, Identifier [Axis]: Datacom, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [10] 10.00%   10.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10] $ 621   $ 621    
Investment, Identifier [Axis]: Datacom, LLC, , Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [10] 7.50%   7.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10] $ 75   $ 75    
Investment, Identifier [Axis]: Datacom, LLC, Preferred Member Units          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     (70) 30  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     30 [2],[9] 10  
Gross Additions     40 30  
Gross Reductions     70 0  
Ending balance $ 0 $ 40 $ 0 $ 40  
Investment, Identifier [Axis]: Datacom, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 7.50% 7.50% 7.50% 7.50% 7.50% [9]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     6 3  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     55 [2],[9] 49  
Gross Additions     85 50  
Gross Reductions     65 60  
Ending balance $ 75 $ 39 $ 75 $ 39  
Investment, Identifier [Axis]: Datacom, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.00% 10.00% 10.00% 10.00% 10.00% [9]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (250) 7  
Amount of Interest, Fees or Dividends Credited to Income     82 86  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     878 [2],[9] 844  
Gross Additions     15 24  
Gross Reductions     272 23  
Ending balance $ 621 $ 845 621 845  
Investment, Identifier [Axis]: Digital Products Holdings LLC, Preferred Member Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[26] $ 2,459   $ 2,459    
Investment, Identifier [Axis]: Digital Products Holdings LLC, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate [10],[21] 14.31%   14.31%    
Spread [10],[21],[22] 10.00%   10.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[21] $ 2,949   $ 2,949    
Investment, Identifier [Axis]: Digital Products Holdings LLC, Preferred Member Units          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     38 38  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     2,459 [2],[9],[25] 2,459  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance $ 2,459 $ 2,459 $ 2,459 $ 2,459  
Investment, Identifier [Axis]: Digital Products Holdings LLC, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 14.31% 15.25% 14.31% 15.25% 14.56% [9],[28]
Spread 10.00% 10.00% 10.00% 10.00% 10.00% [9],[28],[29]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     337 410  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     3,105 [2],[9],[28] 3,673  
Gross Additions     8 12  
Gross Reductions     164 482  
Ending balance $ 2,949 $ 3,203 2,949 3,203  
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc., Preferred Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10] 4,770   4,770    
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc., Preferred Stock          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     290 (360)  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     4,480 [2],[9] 5,180  
Gross Additions     290 0  
Gross Reductions     0 360  
Ending balance $ 4,770 4,820 $ 4,770 4,820  
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc., Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [10] 14.00%   14.00%    
Amount of Realized Gain/(Loss)     $ 0 0  
Amount of Unrealized Gain/(Loss)     (1) (1)  
Amount of Interest, Fees or Dividends Credited to Income     7 10  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [2],[9],[30] 217  
Gross Additions     181 301  
Gross Reductions     1 518  
Ending balance $ 180 [5],[10] $ 0 $ 180 [5],[10] $ 0  
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc., Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 14.00% [10] 14.00% 14.00% [10] 14.00% 14.00% [9]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (9) (11)  
Amount of Interest, Fees or Dividends Credited to Income     492 529  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     4,668 [2],[9] 5,002  
Gross Additions     9 11  
Gross Reductions     176 262  
Ending balance $ 4,501 [5],[10] $ 4,751 4,501 [5],[10] 4,751  
Investment, Identifier [Axis]: Dynamic Communities, LLC, Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     0    
Ending balance [5],[14],[20] 0   0    
Investment, Identifier [Axis]: Dynamic Communities, LLC, Preferred Equity 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     60    
Ending balance [5],[14],[20] 110   110    
Investment, Identifier [Axis]: Dynamic Communities, LLC, Preferred Equity 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     0    
Ending balance [5],[14],[20] $ 0   $ 0    
Investment, Identifier [Axis]: Dynamic Communities, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 12.26% [14],[20],[21]   12.26% [14],[20],[21]   11.46% [12],[24],[28]
Spread 8.00% [14],[20],[21],[22]   8.00% [14],[20],[21],[22]   7.00% [12],[24],[28],[29]
PIK Rate 12.26% [14],[15],[20],[21]   12.26% [14],[15],[20],[21]   11.46% [12],[16],[24],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 2,220    
Ending balance [5],[14],[20],[21] $ 2,534   $ 2,534    
Investment, Identifier [Axis]: Dynamic Communities, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 13.26% [14],[20],[21]   13.26% [14],[20],[21]   13.46% [12],[24],[28]
Spread 9.00% [14],[20],[21],[22]   9.00% [14],[20],[21],[22]   9.00% [12],[24],[28],[29]
PIK Rate [12],[16],[24],[28]         13.46%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 2,219    
Ending balance [5],[14],[20],[21] $ 2,463   $ 2,463    
Investment, Identifier [Axis]: Electro Technical Industries, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread [14],[20],[21],[22],[23] 5.50%   5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21],[23] $ (77)   $ (77)    
Investment, Identifier [Axis]: Electro Technical Industries, LLC, Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20] $ 920   $ 920    
Investment, Identifier [Axis]: Electro Technical Industries, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 9.66%   9.66%    
Spread [14],[20],[21],[22] 5.50%   5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 24,587   $ 24,587    
Investment, Identifier [Axis]: Elgin AcquireCo, LLC, Common Stock 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     370    
Ending balance [5],[14] 330   330    
Investment, Identifier [Axis]: Elgin AcquireCo, LLC, Common Stock 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[37]     199    
Ending balance [5],[14],[36] $ 211   $ 211    
Investment, Identifier [Axis]: Elgin AcquireCo, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 6.00% [14],[21],[22],[23]   6.00% [14],[21],[22],[23]   6.00% [12],[28],[29],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[28],[30]     $ 0    
Ending balance [5],[14],[21],[23] $ 0   $ 0    
Investment, Identifier [Axis]: Elgin AcquireCo, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.00% [14]   12.00% [14]   12.00% [12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     $ 1,162    
Ending balance [5],[14] $ 1,117   $ 1,117    
Investment, Identifier [Axis]: Elgin AcquireCo, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 9.00% [14]   9.00% [14]   9.00% [12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     $ 406    
Ending balance [5],[14] $ 403   $ 403    
Investment, Identifier [Axis]: Emerald Technologies Acquisition Co, Inc., Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 10.60% [13],[14],[21]   10.60% [13],[14],[21]   10.71% [11],[12],[28]
Spread 6.25% [13],[14],[21],[22]   6.25% [13],[14],[21],[22]   6.25% [11],[12],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12],[28]     $ 1,863    
Ending balance [5],[13],[14],[21] $ 1,597   1,597    
Investment, Identifier [Axis]: Escalent, Inc., Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     240    
Ending balance [5],[14],[20],[26] $ 240   $ 240    
Investment, Identifier [Axis]: Escalent, Inc., Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 9.99%   9.99%    
Spread 6.00% [14],[20],[21],[22]   6.00% [14],[20],[21],[22]   8.00% [12],[24],[28],[29],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     $ (7)    
Ending balance [5],[14],[20],[21] $ 133   $ 133    
Investment, Identifier [Axis]: Escalent, Inc., Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.00% [14],[20],[21]   10.00% [14],[20],[21]   12.39% [12],[24],[28]
Spread 6.00% [14],[20],[21],[22]   6.00% [14],[20],[21],[22]   8.00% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 358    
Ending balance [5],[14],[20],[21] $ 359   $ 359    
Investment, Identifier [Axis]: Escalent, Inc., Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 10.00% [14],[20],[21]   10.00% [14],[20],[21]   12.43% [12],[24],[28]
Spread 6.00% [14],[20],[21],[22]   6.00% [14],[20],[21],[22]   8.00% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 6,855    
Ending balance [5],[14],[20],[21] $ 6,767   $ 6,767    
Investment, Identifier [Axis]: Event Holdco, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 11.26% [14],[20],[21]   11.26% [14],[20],[21]   12.59% [12],[24],[28]
Spread 7.00% [14],[20],[21],[22]   7.00% [14],[20],[21],[22]   8.00% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 308    
Ending balance [5],[14],[20],[21] $ 308   $ 308    
Investment, Identifier [Axis]: Event Holdco, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.26% [14],[20],[21]   11.26% [14],[20],[21]   12.59% [12],[24],[28]
Spread 7.00% [14],[20],[21],[22]   7.00% [14],[20],[21],[22]   8.00% [12],[24],[28],[29]
PIK Rate [12],[16],[24],[28]         6.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 3,969    
Ending balance [5],[14],[20],[21] $ 4,014   $ 4,014    
Investment, Identifier [Axis]: FCC Intermediate Holdco, LLC, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 13.00% [14]   13.00% [14]   13.00% [12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     $ 7,135    
Ending balance [5],[14] $ 7,892   7,892    
Investment, Identifier [Axis]: FCC Intermediate Holdco, LLC, Warrants          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[18]     2,710    
Ending balance [5],[14],[19],[26] $ 3,780   $ 3,780    
Investment, Identifier [Axis]: First American Treasury Obligations Fund Class Z          
Schedule of Investments [Line Items]          
Total Rate 4.07%   4.07%   4.41%
Investment, Identifier [Axis]: Flame King Holdings, LLC, Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       1,970  
Amount of Interest, Fees or Dividends Credited to Income       808  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     $ 8,980 [2],[9],[25] 6,970  
Gross Additions       1,970  
Gross Reductions       0  
Ending balance $ 12,030 [5],[10],[26] 8,940 12,030 [5],[10],[26] 8,940  
Investment, Identifier [Axis]: Flame King Holdings, LLC, Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     3,050    
Amount of Interest, Fees or Dividends Credited to Income     1,968    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     8,980    
Gross Additions     3,050    
Gross Reductions     0    
Ending balance $ 12,030   $ 12,030    
Investment, Identifier [Axis]: Flame King Holdings, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 12.00%   12.00%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     0    
Gross Reductions     0    
Ending balance [5],[10],[23] $ 0   $ 0    
Investment, Identifier [Axis]: Flame King Holdings, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [10] 12.00%   12.00%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     308    
Amount of Interest, Fees or Dividends Credited to Income     533    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     16,500    
Gross Reductions     0    
Ending balance [5],[10] $ 16,500   16,500    
Investment, Identifier [Axis]: Freeport Financial Funds, LP Interests (Freeport First Lien Loan Fund III LP)          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     (82) 193  
Amount of Interest, Fees or Dividends Credited to Income     0 38  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,263 [2],[9],[25],[39],[43],[44] 3,705  
Gross Additions     0 193  
Gross Reductions     1,070 2,005  
Ending balance 193 [5],[10],[41],[45],[46] 1,893 193 [5],[10],[41],[45],[46] 1,893  
Investment, Identifier [Axis]: GFG Group, LLC, Preferred Member Units          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     100 (230)  
Amount of Interest, Fees or Dividends Credited to Income     182 323  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     2,640 [2],[9],[25] 2,870  
Gross Additions     100 0  
Gross Reductions     0 230  
Ending balance $ 2,740 [5],[10],[26] $ 2,640 $ 2,740 [5],[10],[26] $ 2,640  
Investment, Identifier [Axis]: GFG Group, LLC, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 8.00% [10] 8.00% 8.00% [10] 8.00% 8.00% [9]
Amount of Realized Gain/(Loss)       $ 0  
Amount of Unrealized Gain/(Loss)       (14)  
Amount of Interest, Fees or Dividends Credited to Income       153  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     $ 2,046 [2],[9] 2,336  
Gross Additions       14  
Gross Reductions       304  
Ending balance $ 3,513 [5],[10] $ 2,046 3,513 [5],[10] 2,046  
Investment, Identifier [Axis]: GFG Group, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     (16)    
Amount of Interest, Fees or Dividends Credited to Income     57    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     2,046    
Gross Additions     0    
Gross Reductions     2,046    
Ending balance 0   0    
Investment, Identifier [Axis]: GFG Group, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     46    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     0    
Gross Reductions     0    
Ending balance $ 0   $ 0    
Investment, Identifier [Axis]: GFG Group, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 8.00%   8.00%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     14    
Amount of Interest, Fees or Dividends Credited to Income     74    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     3,513    
Gross Reductions     0    
Ending balance $ 3,513   $ 3,513    
Investment, Identifier [Axis]: GRT Rubber Technologies LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [8] 10.41%   10.41%    
Spread [8],[22] 6.00%   6.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[8] $ 1,550   $ 1,550    
Investment, Identifier [Axis]: GRT Rubber Technologies LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [8] 12.41%   12.41%    
Spread [8],[22] 8.00%   8.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[8] $ 19,944   $ 19,944    
Investment, Identifier [Axis]: GRT Rubber Technologies LLC, Member Units          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     460 0  
Amount of Interest, Fees or Dividends Credited to Income     2,108 93  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     22,600 [2],[7] 21,890  
Gross Additions     460 0  
Gross Reductions     0 0  
Ending balance $ 23,060 [5],[8],[26] $ 21,890 $ 23,060 [5],[8],[26] $ 21,890  
Investment, Identifier [Axis]: GRT Rubber Technologies LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 10.41% 11.35% 10.41% 11.35% 10.66% [7]
Spread 6.00% 6.00% 6.00% 6.00% 6.00% [7],[29]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (4) 4  
Amount of Interest, Fees or Dividends Credited to Income     127 123  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,550 [2],[7] 1,182  
Gross Additions     4 368  
Gross Reductions     4 0  
Ending balance $ 1,550 $ 1,550 $ 1,550 $ 1,550  
Investment, Identifier [Axis]: GRT Rubber Technologies LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.41% 13.35% 12.41% 13.35% 12.66% [7]
Spread 8.00% 8.00% 8.00% 8.00% 8.00% [7],[29]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (37) (37)  
Amount of Interest, Fees or Dividends Credited to Income     1,922 2,080  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     19,944 [2],[7] 19,944  
Gross Additions     37 37  
Gross Reductions     37 37  
Ending balance $ 19,944 $ 19,944 19,944 19,944  
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC, Member Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[26] 29,170   29,170    
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC, Member Units          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     480 2,660  
Amount of Interest, Fees or Dividends Credited to Income     1,286 1,352  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     28,690 [2],[9],[25] 24,180  
Gross Additions     480 2,660  
Gross Reductions     0 0  
Ending balance $ 29,170 $ 26,840 $ 29,170 $ 26,840  
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 7.50% [10],[21],[22],[23],[48] 7.00% 7.50% [10],[21],[22],[23],[48] 7.00% 7.00% [9],[28],[29],[30],[49]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     1 1  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [2],[9],[28],[30],[49] 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance $ 0 [5],[10],[21],[23],[48] $ 0 $ 0 [5],[10],[21],[23],[48] $ 0  
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.50% [10],[21]   11.50% [10],[21]   11.00% [9],[28],[49]
Spread 7.50% [10],[21],[22]   7.50% [10],[21],[22]   7.00% [9],[28],[29],[49]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9],[28],[49]     $ 18,282    
Ending balance [5],[10],[21] $ 17,682   $ 17,682    
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC, Secured Debt 2.1          
Schedule of Investments [Line Items]          
Total Rate 11.50% 10.00% 11.50% 10.00%  
Spread 7.50% 7.00% 7.50% 7.00%  
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (31) (50)  
Amount of Interest, Fees or Dividends Credited to Income     1,617 1,036  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     18,282 13,520  
Gross Additions     31 50  
Gross Reductions     631 1,450  
Ending balance $ 17,682 $ 12,120 17,682 $ 12,120  
Investment, Identifier [Axis]: Garyline, LLC, Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     150    
Ending balance [5],[14],[20] $ 130   $ 130    
Investment, Identifier [Axis]: Garyline, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 11.20% [14],[20],[21]   11.20% [14],[20],[21]   11.29% [12],[24],[28],[35]
Spread 7.00% [14],[20],[21],[22]   7.00% [14],[20],[21],[22]   6.75% [12],[24],[28],[29],[35]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[35]     $ 2,416    
Ending balance [5],[14],[20],[21] $ 917   $ 917    
Investment, Identifier [Axis]: Garyline, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.14% [14],[20],[21]   11.14% [14],[20],[21]   11.34% [12],[24],[28]
Spread 7.00% [14],[20],[21],[22]   7.00% [14],[20],[21],[22]   6.75% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 9,567    
Ending balance [5],[14],[20],[21] $ 8,568   8,568    
Investment, Identifier [Axis]: GradeEight Corp., Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     471    
Ending balance [5],[14],[20] $ 330   $ 330    
Investment, Identifier [Axis]: GradeEight Corp., Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 6.25% [14],[20],[21],[22],[23]   6.25% [14],[20],[21],[22],[23]   7.25% [12],[24],[28],[29],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     $ (45)    
Ending balance [5],[14],[20],[21],[23] $ (38)   $ (38)    
Investment, Identifier [Axis]: GradeEight Corp., Secured Debt 2          
Schedule of Investments [Line Items]          
Spread 7.25% [14],[20],[21],[22],[23]   7.25% [14],[20],[21],[22],[23]   7.25% [12],[24],[28],[29],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     $ (22)    
Ending balance [5],[14],[20],[21],[23] $ (19)   $ (19)    
Investment, Identifier [Axis]: GradeEight Corp., Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 11.47% [14],[20],[21],[50]   11.47% [14],[20],[21],[50]   11.74% [12],[24],[28]
Spread 7.25% [14],[20],[21],[22],[50]   7.25% [14],[20],[21],[22],[50]   7.25% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 14,542    
Ending balance [5],[14],[20],[21],[50] $ 14,199   $ 14,199    
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 9.50% 9.50% 9.50% 9.50%  
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance $ 0 $ 0 0 $ 0  
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate   12.50%   12.50%  
PIK Rate   12.50%   12.50%  
Amount of Realized Gain/(Loss)     (58) $ 0  
Amount of Unrealized Gain/(Loss)     202 (220)  
Amount of Interest, Fees or Dividends Credited to Income     0 19  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     378 571  
Gross Additions     156 0  
Gross Reductions     534 220  
Ending balance 0 $ 351 0 351  
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC, Member Units          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     (920) 0  
Amount of Unrealized Gain/(Loss)     920 0  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [2],[9] 0  
Gross Additions     920 0  
Gross Reductions     920 0  
Ending balance 0 0 0 0  
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC, Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     (1,400) 0  
Amount of Unrealized Gain/(Loss)     1,400 (620)  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [2],[9] 620  
Gross Additions     1,400 0  
Gross Reductions     1,400 620  
Ending balance 0 0 0 0  
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread [9],[28],[29],[30],[33]         9.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9],[28],[30],[33]     0    
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [9],[33]         12.50%
PIK Rate [9],[16],[33]         12.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9],[33]     378    
Investment, Identifier [Axis]: HDC/HW Intermediate Holdings, Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     0    
Ending balance [5],[14],[20] $ 0   $ 0    
Investment, Identifier [Axis]: HDC/HW Intermediate Holdings, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 13.34% [14],[20],[21]   13.34% [14],[20],[21]   8.75% [12],[24],[28]
Spread 9.00% [14],[20],[21],[22]   9.00% [14],[20],[21],[22]   3.50% [12],[24],[28],[29]
PIK Rate [12],[16],[24],[28]         2.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 1,307    
Ending balance [5],[14],[20],[21] $ 51   $ 51    
Investment, Identifier [Axis]: HDC/HW Intermediate Holdings, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.01% [14],[20],[21]   9.01% [14],[20],[21]   2.50% [12],[24],[33]
Spread [14],[20],[21],[22] 3.50%   3.50%    
PIK Rate 2.50% [14],[15],[20],[21]   2.50% [14],[15],[20],[21]   2.50% [12],[16],[24],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[33]     $ 235    
Ending balance [5],[14],[20],[21] $ 1,478   $ 1,478    
Investment, Identifier [Axis]: HDC/HW Intermediate Holdings, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [14],[17],[20] 2.50%   2.50%    
PIK Rate [14],[15],[17],[20] 2.50%   2.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[17],[20] $ 40   $ 40    
Investment, Identifier [Axis]: HEADLANDS OP-CO LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread [12],[24],[28],[29],[30]         6.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     (10)    
Investment, Identifier [Axis]: HEADLANDS OP-CO LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         10.86%
Spread [12],[24],[28],[29]         6.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     1,975    
Investment, Identifier [Axis]: HEADLANDS OP-CO LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         10.86%
Spread [12],[24],[28],[29]         6.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     1,396    
Investment, Identifier [Axis]: HEADLANDS OP-CO LLC, Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         10.86%
Spread [12],[24],[28],[29]         6.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     4,875    
Investment, Identifier [Axis]: HEADLANDS OP-CO LLC, Secured Debt 5          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         10.86%
Spread [12],[24],[28],[29]         6.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     2,382    
Investment, Identifier [Axis]: HPEP 3, L.P., LP Interests (HPEP 3, L.P.)          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     194 247  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     4,472 4,225  
Gross Additions     194 247  
Gross Reductions     534 0  
Ending balance 4,132 4,472 4,132 4,472  
Investment, Identifier [Axis]: Harris Preston Fund Investments, LP Interests (2717 MH, L.P.)          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     5,295 57  
Amount of Unrealized Gain/(Loss)     (4,829) 2,769  
Amount of Interest, Fees or Dividends Credited to Income     0 278  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     8,740 [2],[7],[25],[39],[43],[44] 6,050  
Gross Additions     3,875 2,826  
Gross Reductions     10,890 57  
Ending balance 1,725 [5],[8],[41],[45],[46] 8,819 1,725 [5],[8],[41],[45],[46] 8,819  
Investment, Identifier [Axis]: Harris Preston Fund Investments, LP Interests (423 AER II, LP)          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[41],[45],[46] 1,526   1,526    
Investment, Identifier [Axis]: Harris Preston Fund Investments, LP Interests (HPEP 3, L.P.)          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9],[39],[43],[44]     4,472    
Ending balance [5],[10],[41],[45],[46] 4,132   4,132    
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC, Preferred Member Units 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[25]     5,060    
Ending balance [5],[14],[26] 6,140   6,140    
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC, Preferred Member Units 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[37]     270    
Ending balance [5],[14],[36] $ 320   $ 320    
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 10.48% [14],[21]   10.48% [14],[21]   10.73% [12],[28]
Spread 6.00% [14],[21],[22]   6.00% [14],[21],[22]   6.00% [12],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[28]     $ 661    
Ending balance [5],[14],[21] $ 542   $ 542    
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.00% [14]   12.00% [14]   12.50% [12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     $ 9,744    
Ending balance [5],[14] $ 9,744   $ 9,744    
Investment, Identifier [Axis]: Hornblower Sub, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 9.65% [14],[20],[21],[27]   9.65% [14],[20],[21],[27]   9.92% [12],[24],[28]
Spread 5.50% [14],[20],[21],[22],[27]   5.50% [14],[20],[21],[22],[27]   5.50% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 1,204    
Ending balance [5],[14],[20],[21],[27] $ 2,056   $ 2,056    
Investment, Identifier [Axis]: Hornblower Sub, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.80% [14],[20],[21]   9.80% [14],[20],[21]   10.11% [12],[24],[28]
Spread 5.50% [14],[20],[21],[22]   5.50% [14],[20],[21],[22]   5.50% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 15,338    
Ending balance [5],[14],[20],[21] $ 16,114   16,114    
Investment, Identifier [Axis]: Hybrid Promotions, LLC , Secured Debt          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         13.10%
Spread [12],[24],[28],[29]         8.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 8,000    
Investment, Identifier [Axis]: Hybrid Promotions, LLC, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 12.54%   12.54%    
Spread [14],[20],[21],[22] 8.25%   8.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 8,000   $ 8,000    
Investment, Identifier [Axis]: IG Investor, LLC, Common Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     1,130 120  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     4,060 [2],[9] 3,600  
Gross Additions     1,130 120  
Gross Reductions     0 0  
Ending balance $ 5,190 [5],[10] $ 3,720 $ 5,190 [5],[10] $ 3,720  
Investment, Identifier [Axis]: IG Investor, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 13.00% [10] 13.00% 13.00% [10] 13.00% 13.00% [9]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     16 0  
Amount of Interest, Fees or Dividends Credited to Income     46 17  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     379 [2],[9] (27)  
Gross Additions     21 405  
Gross Reductions     0 0  
Ending balance $ 400 [5],[10] $ 378 $ 400 [5],[10] $ 378  
Investment, Identifier [Axis]: IG Investor, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 13.00% [10] 13.00% 13.00% [10] 13.00% 13.00% [9]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     143 0  
Amount of Interest, Fees or Dividends Credited to Income     905 948  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     8,693 [2],[9] 9,069  
Gross Additions     183 48  
Gross Reductions     110 330  
Ending balance $ 8,766 [5],[10] $ 8,787 $ 8,766 [5],[10] 8,787  
Investment, Identifier [Axis]: IG Parent Corporation, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 5.75% [13],[14],[21],[22],[23]   5.75% [13],[14],[21],[22],[23]   5.75% [11],[12],[28],[29],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12],[28],[30]     $ 0    
Ending balance [5],[13],[14],[21],[23] $ 0   $ 0    
Investment, Identifier [Axis]: IG Parent Corporation, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.01% [13],[14],[21]   10.01% [13],[14],[21]   10.21% [11],[12],[28]
Spread 5.75% [13],[14],[21],[22]   5.75% [13],[14],[21],[22]   5.75% [11],[12],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12],[28]     $ 6,154    
Ending balance [5],[13],[14],[21] $ 6,154   $ 6,154    
Investment, Identifier [Axis]: IG Parent Corporation, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 10.01% [13],[14],[21]   10.01% [13],[14],[21]   10.21% [11],[12],[28]
Spread 5.75% [13],[14],[21],[22]   5.75% [13],[14],[21],[22]   5.75% [11],[12],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12],[28]     $ 1,922    
Ending balance [5],[13],[14],[21] $ 1,907   $ 1,907    
Investment, Identifier [Axis]: ITA Holdings Group, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 11.46% [14],[21]   11.46% [14],[21]   13.78% [12],[28]
Spread 7.00% [14],[21],[22]   7.00% [14],[21],[22]   9.00% [12],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[28]     $ 295    
Ending balance [5],[14],[21] $ 295   $ 295    
Investment, Identifier [Axis]: ITA Holdings Group, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.46% [14],[21]   11.46% [14],[21]   13.78% [12],[28]
Spread 7.00% [14],[21],[22]   7.00% [14],[21],[22]   9.00% [12],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[28]     $ 248    
Ending balance [5],[14],[21] $ 590   $ 590    
Investment, Identifier [Axis]: ITA Holdings Group, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 11.46% [14],[21]   11.46% [14],[21]   12.78% [12],[28]
Spread 7.00% [14],[21],[22]   7.00% [14],[21],[22]   8.00% [12],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[28]     $ 1,110    
Ending balance [5],[14],[21] $ 1,234   $ 1,234    
Investment, Identifier [Axis]: ITA Holdings Group, LLC, Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 11.46% [14],[21]   11.46% [14],[21]   14.78% [12],[28]
Spread 7.00% [14],[21],[22]   7.00% [14],[21],[22]   10.00% [12],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[28]     $ 1,110    
Ending balance [5],[14],[21] $ 1,234   $ 1,234    
Investment, Identifier [Axis]: ITA Holdings Group, LLC, Secured Debt 5          
Schedule of Investments [Line Items]          
Total Rate [14],[21] 11.46%   11.46%    
Spread [14],[21],[22] 7.00%   7.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[21] $ 443   $ 443    
Investment, Identifier [Axis]: ITA Holdings Group, LLC, Warrants          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[18]     1,420    
Ending balance [5],[14],[19],[26] 3,370   3,370    
Investment, Identifier [Axis]: Imaging Business Machines, L.L.C., Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     510    
Ending balance [5],[14],[20] 490   490    
Investment, Identifier [Axis]: Imaging Business Machines, L.L.C., Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28],[35]         11.39%
Spread [12],[24],[28],[29],[35]         7.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[35]     791    
Investment, Identifier [Axis]: Imaging Business Machines, L.L.C., Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         11.62%
Spread [12],[24],[28],[29]         7.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     10,280    
Investment, Identifier [Axis]: Implus Footcare, LLC, Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20] $ 5,320   5,320    
Investment, Identifier [Axis]: Implus Footcare, LLC, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         13.73%
Spread [12],[24],[28],[29]         7.75%
PIK Rate [12],[16],[24],[28]         1.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 14,524    
Investment, Identifier [Axis]: Implus Footcare, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 10.01%   10.01%    
Spread [14],[20],[21],[22] 6.00%   6.00%    
PIK Rate [14],[15],[20],[21] 4.00%   4.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 1,758   $ 1,758    
Investment, Identifier [Axis]: Implus Footcare, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 10.31%   10.31%    
Spread [14],[20],[21],[22] 6.00%   6.00%    
PIK Rate [14],[15],[20],[21] 10.31%   10.31%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 3,943   $ 3,943    
Investment, Identifier [Axis]: Independent Pet Partners Intermediate Holdings, LLC, Common Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     (500) 970  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     7,290 [2],[9],[24] 6,320  
Gross Additions     0 970  
Gross Reductions     500 0  
Ending balance 6,790 [5],[10],[20] 7,290 6,790 [5],[10],[20] 7,290  
Investment, Identifier [Axis]: Infinity X1 Holdings, LLC, Preferred Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[25]     2,310    
Ending balance [5],[14],[26] $ 1,680   $ 1,680    
Investment, Identifier [Axis]: Infinity X1 Holdings, LLC, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 13.00% [14]   13.00% [14]   12.00% [12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     $ 3,763    
Ending balance [5],[14] $ 3,881   3,881    
Investment, Identifier [Axis]: Insight Borrower Corporation, Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     120    
Ending balance [5],[14],[20] $ 100   $ 100    
Investment, Identifier [Axis]: Insight Borrower Corporation, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 10.57%   10.57%    
Spread 6.25% [14],[20],[21],[22]   6.25% [14],[20],[21],[22]   6.25% [12],[24],[28],[29],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     $ (32)    
Ending balance [5],[14],[20],[21] $ 229   229    
Investment, Identifier [Axis]: Insight Borrower Corporation, Secured Debt 2          
Schedule of Investments [Line Items]          
Spread [12],[24],[28],[29],[30]         6.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     $ (27)    
Investment, Identifier [Axis]: Insight Borrower Corporation, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 10.58%   10.58%    
Spread [14],[20],[21],[22] 6.25%   6.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 15,698   $ 15,698    
Investment, Identifier [Axis]: Insight Borrower Corporation, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         10.87%
Spread [12],[24],[28],[29]         6.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 7,869    
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21],[27] 14.38%   14.38%    
Spread [14],[20],[21],[22],[27] 10.00%   10.00%    
PIK Rate [14],[15],[20],[21],[27] 2.00%   2.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21],[27] $ 682   $ 682    
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 14.38%   14.38%    
Spread [14],[20],[21],[22] 10.00%   10.00%    
PIK Rate [14],[15],[20],[21] 2.00%   2.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 5,842   $ 5,842    
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 14.38%   14.38%    
Spread [14],[20],[21],[22] 10.00%   10.00%    
PIK Rate [14],[15],[20],[21] 2.00%   2.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 1,176   $ 1,176    
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC, Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 14.38%   14.38%    
Spread [14],[20],[21],[22] 10.00%   10.00%    
PIK Rate [14],[15],[20],[21] 2.00%   2.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 271   $ 271    
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC, Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     21    
Ending balance [5],[14],[20] 75   75    
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28],[35]         14.69%
Spread [12],[24],[28],[29],[35]         10.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[35]     620    
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         14.58%
Spread [12],[24],[28],[29]         10.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     5,681    
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         14.58%
Spread [12],[24],[28],[29]         10.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     1,144    
Investment, Identifier [Axis]: Integral Energy Services, Common Stock          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     170 450  
Amount of Interest, Fees or Dividends Credited to Income     0 38  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     640 [2],[9],[24] 190  
Gross Additions     170 450  
Gross Reductions     0 0  
Ending balance $ 810 [5],[10],[20] $ 640 810 [5],[10],[20] $ 640  
Investment, Identifier [Axis]: Integral Energy Services, Preferred Equity          
Schedule of Investments [Line Items]          
Total Rate   10.00%   10.00% 10.00% [9],[24],[25]
PIK Rate   10.00%   10.00% 10.00% [9],[16],[24],[25]
Amount of Realized Gain/(Loss)       $ 0  
Amount of Unrealized Gain/(Loss)       153  
Amount of Interest, Fees or Dividends Credited to Income       24  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     $ 535 [2],[9],[24],[25] 350  
Gross Additions       177  
Gross Reductions       0  
Ending balance   $ 527   $ 527  
Investment, Identifier [Axis]: Integral Energy Services, Preferred Equity 1          
Schedule of Investments [Line Items]          
Total Rate [10],[20],[26] 10.00%   10.00%    
PIK Rate [10],[15],[20],[26] 10.00%   10.00%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     60    
Amount of Interest, Fees or Dividends Credited to Income     23    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     535    
Gross Additions     83    
Gross Reductions     0    
Ending balance [5],[10],[20],[26] $ 618   $ 618    
Investment, Identifier [Axis]: Integral Energy Services, Preferred Equity 2          
Schedule of Investments [Line Items]          
Total Rate [10],[20] 10.00%   10.00%    
PIK Rate [10],[15],[20] 10.00%   10.00%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     97    
Amount of Interest, Fees or Dividends Credited to Income     0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     230    
Gross Reductions     0    
Ending balance [5],[10],[20] $ 230   $ 230    
Investment, Identifier [Axis]: Integral Energy Services, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 12.05% [10],[20],[21] 13.09% 12.05% [10],[20],[21] 13.09% 12.35% [9],[24],[28]
Spread 7.50% [10],[20],[21],[22] 7.50% 7.50% [10],[20],[21],[22] 7.50% 7.50% [9],[24],[28],[29]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (114) 273  
Amount of Interest, Fees or Dividends Credited to Income     1,436 1,633  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     14,872 [2],[9],[24],[28] 16,232  
Gross Additions     48 342  
Gross Reductions     864 1,835  
Ending balance $ 14,056 [5],[10],[20],[21] $ 14,739 14,056 [5],[10],[20],[21] 14,739  
Investment, Identifier [Axis]: Interface Security Systems, L.L.C, Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     0    
Ending balance [5],[14],[20] $ 0   $ 0    
Investment, Identifier [Axis]: Interface Security Systems, L.L.C, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 14.20% [14],[20],[27],[47]   14.20% [14],[20],[27],[47]   14.54% [12],[24],[34],[35]
Spread 10.00% [14],[20],[22],[27],[47]   10.00% [14],[20],[22],[27],[47]   10.00% [12],[24],[29],[34],[35]
PIK Rate 14.20% [14],[15],[20],[27],[47]   14.20% [14],[15],[20],[27],[47]   14.54% [12],[16],[24],[34],[35]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[34],[35]     $ 1,580    
Ending balance [5],[14],[20],[27],[47] $ 1,932   $ 1,932    
Investment, Identifier [Axis]: Interface Security Systems, L.L.C, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.43% [14],[17],[20],[21],[47]   11.43% [14],[17],[20],[21],[47]   11.67% [12],[24],[28],[33],[34]
Spread 7.00% [14],[17],[20],[21],[22],[47]   7.00% [14],[17],[20],[21],[22],[47]   7.00% [12],[24],[28],[29],[33],[34]
PIK Rate 11.43% [14],[15],[17],[20],[21],[47]   11.43% [14],[15],[17],[20],[21],[47]   11.67% [12],[16],[24],[28],[33],[34]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[33],[34]     $ 13    
Ending balance [5],[14],[17],[20],[21],[47] $ 5   $ 5    
Investment, Identifier [Axis]: Invincible Boat Company, LLC., Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 11.81% [14],[20],[21],[27]   11.81% [14],[20],[21],[27]   12.01% [12],[24],[28],[35]
Spread 7.50% [14],[20],[21],[22],[27]   7.50% [14],[20],[21],[22],[27]   7.50% [12],[24],[28],[29],[35]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[35]     $ 996    
Ending balance [5],[14],[20],[21],[27] $ 958   $ 958    
Investment, Identifier [Axis]: Invincible Boat Company, LLC., Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.81% [14],[20],[21]   11.81% [14],[20],[21]   12.01% [12],[24],[28]
Spread 7.50% [14],[20],[21],[22]   7.50% [14],[20],[21],[22]   7.50% [12],[24],[28],[29]
PIK Rate [14],[15],[20],[21] 3.81%   3.81%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 16,098    
Ending balance [5],[14],[20],[21] $ 15,086   15,086    
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     710    
Ending balance [5],[14],[20] $ 680   680    
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Preferred Equity          
Schedule of Investments [Line Items]          
Total Rate [12]         25.00%
PIK Rate [12],[16]         25.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     $ 190    
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Preferred Equity 1          
Schedule of Investments [Line Items]          
Total Rate [14],[20] 25.00%   25.00%    
PIK Rate [14],[15],[20] 25.00%   25.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20] $ 240   $ 240    
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Preferred Equity 2          
Schedule of Investments [Line Items]          
Total Rate [14],[20] 25.00%   25.00%    
PIK Rate [14],[15],[20] 25.00%   25.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20] $ 39   $ 39    
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 13.00% [14],[20]   13.00% [14],[20]   13.00% [12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     $ 1,113    
Ending balance [5],[14],[20] $ 1,117   $ 1,117    
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 13.00% [14],[20]   13.00% [14],[20]   13.00% [12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     $ 725    
Ending balance [5],[14],[20] $ 727   $ 727    
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 13.00% [14],[20]   13.00% [14],[20]   13.00% [12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     $ 2,236    
Ending balance [5],[14],[20] $ 2,236   $ 2,236    
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 13.00% [14],[20]   13.00% [14],[20]   13.00% [12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     $ 4,344    
Ending balance [5],[14],[20] $ 4,359   $ 4,359    
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Secured Debt 5          
Schedule of Investments [Line Items]          
Total Rate 13.00% [14],[20]   13.00% [14],[20]   13.00% [12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     $ 2,379    
Ending balance [5],[14],[20] $ 2,329   2,329    
Investment, Identifier [Axis]: Isagenix International, LLC, Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12]     0    
Ending balance [5],[13],[14] $ 0   $ 0    
Investment, Identifier [Axis]: Isagenix International, LLC, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 2.50% [13],[14],[21],[51]   2.50% [13],[14],[21],[51]   11.25% [11],[12],[28]
Spread [11],[12],[28],[29]         6.60%
PIK Rate [11],[12],[16],[28]         8.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12],[28]     $ 622    
Ending balance [5],[13],[14],[21],[51] $ 430   $ 430    
Investment, Identifier [Axis]: Island Pump and Tank, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 11.41%   11.41%    
Spread 7.00% [14],[20],[21],[22]   7.00% [14],[20],[21],[22]   6.50% [12],[24],[28],[29],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     $ (5)    
Ending balance [5],[14],[20],[21] $ 454   $ 454    
Investment, Identifier [Axis]: Island Pump and Tank, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.55% [14],[20],[21],[50]   10.55% [14],[20],[21],[50]   10.35% [12],[24],[28]
Spread 6.00% [14],[20],[21],[22],[50]   6.00% [14],[20],[21],[22],[50]   5.50% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 1,722    
Ending balance [5],[14],[20],[21],[50] $ 2,101   $ 2,101    
Investment, Identifier [Axis]: Island Pump and Tank, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 11.55% [14],[20],[21],[50]   11.55% [14],[20],[21],[50]   11.35% [12],[24],[28]
Spread 7.00% [14],[20],[21],[22],[50]   7.00% [14],[20],[21],[22],[50]   6.50% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 1,722    
Ending balance [5],[14],[20],[21],[50] $ 2,101   $ 2,101    
Investment, Identifier [Axis]: Island Pump and Tank, LLC, Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 12.55% [14],[20],[21],[50]   12.55% [14],[20],[21],[50]   12.35% [12],[24],[28]
Spread 8.00% [14],[20],[21],[22],[50]   8.00% [14],[20],[21],[22],[50]   7.50% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 1,722    
Ending balance [5],[14],[20],[21],[50] $ 2,101   $ 2,101    
Investment, Identifier [Axis]: JDC Power Services, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 6.25% [14],[20],[21],[22],[23]   6.25% [14],[20],[21],[22],[23]   6.50% [12],[24],[28],[29],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     $ (47)    
Ending balance [5],[14],[20],[21],[23] $ (39)   $ (39)    
Investment, Identifier [Axis]: JDC Power Services, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.25% [14],[20],[21]   10.25% [14],[20],[21]   10.83% [12],[24],[28]
Spread 6.25% [14],[20],[21],[22]   6.25% [14],[20],[21],[22]   6.50% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 17,489    
Ending balance [5],[14],[20],[21] $ 17,336   17,336    
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC, Common Eqiuty          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     30    
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC, Common Eqiuty 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[36] 0   0    
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC, Common Eqiuty 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20] $ 0   $ 0    
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 9.45% [14],[20],[21]   9.45% [14],[20],[21]   12.72% [12],[24],[28],[35]
Spread 5.00% [14],[20],[21],[22]   5.00% [14],[20],[21],[22]   8.00% [12],[24],[28],[29],[35]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[35]     $ 665    
Ending balance [5],[14],[20],[21] $ 526   $ 526    
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.45% [14],[20],[21]   10.45% [14],[20],[21]   12.58% [12],[24],[28]
Spread 6.00% [14],[20],[21],[22]   6.00% [14],[20],[21],[22]   8.00% [12],[24],[28],[29]
PIK Rate [14],[15],[20],[21] 10.45%   10.45%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 2,823    
Ending balance [5],[14],[20],[21] $ 2,951   $ 2,951    
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 15.00% [14],[17],[20]   15.00% [14],[17],[20]   12.58% [12],[24],[28]
Spread [12],[24],[28],[29]         8.00%
PIK Rate [14],[15],[17],[20] 15.00%   15.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 265    
Ending balance [5],[14],[17],[20] $ 517   517    
Investment, Identifier [Axis]: Jackmont Hospitality, Inc., Preferred Eqiuty          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     1,740    
Ending balance [5],[14],[20] $ 1,500   $ 1,500    
Investment, Identifier [Axis]: Jackmont Hospitality, Inc., Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 11.42% [14],[20],[21],[50]   11.42% [14],[20],[21],[50]   12.18% [12],[24],[28],[52]
Spread 7.00% [14],[20],[21],[22],[50]   7.00% [14],[20],[21],[22],[50]   7.50% [12],[24],[28],[29],[52]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[52]     $ 1,585    
Ending balance [5],[14],[20],[21],[50] $ 1,542   $ 1,542    
Investment, Identifier [Axis]: Jackmont Hospitality, Inc., Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.28% [14],[20],[21],[50]   11.28% [14],[20],[21],[50]   12.19% [12],[24],[28]
Spread 7.00% [14],[20],[21],[22],[50]   7.00% [14],[20],[21],[22],[50]   7.50% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 1,251    
Ending balance [5],[14],[20],[21],[50] $ 1,251   $ 1,251    
Investment, Identifier [Axis]: Jackmont Hospitality, Inc., Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 11.23% [14],[20],[21],[50]   11.23% [14],[20],[21],[50]   12.18% [12],[24],[28]
Spread 7.00% [14],[20],[21],[22],[50]   7.00% [14],[20],[21],[22],[50]   7.50% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 121    
Ending balance [5],[14],[20],[21],[50] $ 1,333   $ 1,333    
Investment, Identifier [Axis]: Jackmont Hospitality, Inc., Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 11.38% [14],[20],[21]   11.38% [14],[20],[21]   12.18% [12],[24],[28]
Spread 7.00% [14],[20],[21],[22]   7.00% [14],[20],[21],[22]   7.50% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 3,685    
Ending balance [5],[14],[20],[21] $ 3,528   3,528    
Investment, Identifier [Axis]: Joerns Healthcare, LLC, Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[13],[14] $ 290   290    
Investment, Identifier [Axis]: Joerns Healthcare, LLC, Common Stock 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12]     0    
Investment, Identifier [Axis]: Joerns Healthcare, LLC, Common Stock 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12]     $ 110    
Investment, Identifier [Axis]: Joerns Healthcare, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 13.13% [13],[14],[21]   13.13% [13],[14],[21]   21.59% [11],[12],[28],[33],[34]
Spread 8.75% [13],[14],[21],[22]   8.75% [13],[14],[21],[22]   16.00% [11],[12],[28],[29],[33],[34]
PIK Rate 6.00% [13],[14],[15],[21]   6.00% [13],[14],[15],[21]   21.59% [11],[12],[16],[28],[33],[34]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12],[28],[33],[34]     $ 0    
Ending balance [5],[13],[14],[21] $ 1,539   $ 1,539    
Investment, Identifier [Axis]: Joerns Healthcare, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 13.13% [13],[14],[21]   13.13% [13],[14],[21]   21.59% [11],[12],[28],[33],[34]
Spread 8.75% [13],[14],[21],[22]   8.75% [13],[14],[21],[22]   16.00% [11],[12],[28],[29],[33],[34]
PIK Rate 6.00% [13],[14],[15],[21]   6.00% [13],[14],[15],[21]   21.59% [11],[12],[16],[28],[33],[34]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12],[28],[33],[34]     $ 0    
Ending balance [5],[13],[14],[21] $ 1,149   1,149    
Investment, Identifier [Axis]: Joerns Healthcare, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [11],[12],[28]         13.21%
Spread [11],[12],[28],[29]         8.75%
PIK Rate [11],[12],[16],[28]         6.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12],[28]     1,470    
Investment, Identifier [Axis]: Joerns Healthcare, LLC, Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate [11],[12],[28]         13.18%
Spread [11],[12],[28],[29]         8.75%
PIK Rate [11],[12],[16],[28]         13.18%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12],[28]     $ 1,091    
Investment, Identifier [Axis]: JorVet Holdings, LLC, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 12.00% [14]   12.00% [14]   12.00% [12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     $ 2,568    
Ending balance [5],[14] $ 2,576   2,576    
Investment, Identifier [Axis]: JorVet Holdings, LLC., Preferred Eqiuty          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[25]     1,460    
Ending balance [5],[14],[26] $ 1,370   $ 1,370    
Investment, Identifier [Axis]: KMS, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 12.50%   12.50%    
PIK Rate 12.50%   12.50%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     132    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     1,432    
Gross Reductions     0    
Ending balance $ 1,432   $ 1,432    
Investment, Identifier [Axis]: KMS, LLC, Secured Debt 1b          
Schedule of Investments [Line Items]          
Spread 9.75%   9.75%    
Amount of Realized Gain/(Loss)     $ 1    
Amount of Unrealized Gain/(Loss)     3,202    
Amount of Interest, Fees or Dividends Credited to Income     0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     5,973    
Gross Additions     0    
Gross Reductions     5,973    
Ending balance $ 0   $ 0    
Investment, Identifier [Axis]: KMS, LLC, Secured Debt 1e          
Schedule of Investments [Line Items]          
Spread 9.75%   9.75%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     4    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     0    
Gross Reductions     0    
Ending balance $ 0   $ 0    
Investment, Identifier [Axis]: KMS, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.50%   12.50%    
PIK Rate 12.50%   12.50%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     115    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     1,504    
Gross Reductions     244    
Ending balance $ 1,260   1,260    
Investment, Identifier [Axis]: KMS, LLC, Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     308    
Amount of Interest, Fees or Dividends Credited to Income     0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     6,421    
Gross Reductions     1    
Ending balance [5],[10],[20] $ 6,420   $ 6,420    
Investment, Identifier [Axis]: KMS, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [10],[20] 12.50%   12.50%    
PIK Rate [10],[15],[20] 12.50%   12.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[20] $ 1,432   $ 1,432    
Investment, Identifier [Axis]: KMS, LLC, Secured Debt 1a          
Schedule of Investments [Line Items]          
Spread 9.75%   9.75%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     409    
Amount of Interest, Fees or Dividends Credited to Income     0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     829    
Gross Additions     0    
Gross Reductions     829    
Ending balance $ 0   $ 0    
Investment, Identifier [Axis]: KMS, LLC, Secured Debt 1c          
Schedule of Investments [Line Items]          
Spread 9.75%   9.75%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     9    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     562    
Gross Additions     0    
Gross Reductions     562    
Ending balance $ 0   $ 0    
Investment, Identifier [Axis]: KMS, LLC, Secured Debt 1d          
Schedule of Investments [Line Items]          
Spread 9.75%   9.75%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     9    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     550    
Gross Additions     0    
Gross Reductions     550    
Ending balance $ 0   $ 0    
Investment, Identifier [Axis]: KMS, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [10],[20] 12.50%   12.50%    
PIK Rate [10],[15],[20] 12.50%   12.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[20] $ 1,260   $ 1,260    
Investment, Identifier [Axis]: KMS, LLC, Wholesaler of Closeout and Value-priced Products, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28],[33]         14.50%
Spread [12],[24],[28],[29],[33]         9.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[33]     829    
Investment, Identifier [Axis]: KMS, LLC, Wholesaler of Closeout and Value-priced Products, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         14.23%
Spread [12],[24],[28],[29]         9.75%
PIK Rate [12],[16],[24],[28]         14.23%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     562    
Investment, Identifier [Axis]: KMS, LLC, Wholesaler of Closeout and Value-priced Products, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         14.23%
Spread [12],[24],[28],[29]         9.75%
PIK Rate [12],[16],[24],[28]         14.23%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     550    
Investment, Identifier [Axis]: KMS, LLC, Wholesaler of Closeout and Value-priced Products, Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28],[33]         14.50%
Spread [12],[24],[28],[29],[33]         9.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[33]     5,973    
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC, Member Units          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     13 (60)  
Amount of Interest, Fees or Dividends Credited to Income     19 24  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     678 [2],[9],[25],[37] 683  
Gross Additions     13 0  
Gross Reductions     1 60  
Ending balance 690 [5],[10],[26],[36] 623 690 [5],[10],[26],[36] 623  
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC, Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     920 640  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     3,060 [2],[9] 2,420  
Gross Additions     920 640  
Gross Reductions     0 0  
Ending balance $ 3,980 [5],[10] $ 3,060 $ 3,980 [5],[10] $ 3,060  
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 12.00% [10] 12.00% 12.00% [10] 12.00% 11.50% [9]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     315 429  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     3,741 [2],[9] 4,933  
Gross Additions     4 6  
Gross Reductions     400 800  
Ending balance $ 3,345 [5],[10] $ 4,139 $ 3,345 [5],[10] $ 4,139  
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.00% [10] 9.00% 9.00% [10] 9.00% 9.00% [9]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     67 66  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     982 [2],[9] 951  
Gross Additions     0 41  
Gross Reductions     9 8  
Ending balance $ 973 [5],[10] $ 984 973 [5],[10] 984  
Investment, Identifier [Axis]: LL Management, Inc., Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         11.89%
Spread [12],[24],[28],[29]         7.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     701    
Investment, Identifier [Axis]: LL Management, Inc., Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         11.92%
Spread [12],[24],[28],[29]         7.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     7,850    
Investment, Identifier [Axis]: LL Management, Inc., Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         11.71%
Spread [12],[24],[28],[29]         7.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     5,181    
Investment, Identifier [Axis]: LL Management, Inc., Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         11.92%
Spread [12],[24],[28],[29]         7.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     860    
Investment, Identifier [Axis]: LL Management, Inc., Secured Debt 5          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         11.71%
Spread [12],[24],[28],[29]         7.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 8,716    
Investment, Identifier [Axis]: LLFlex, LLC, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 12.44% [14],[20],[21]   12.44% [14],[20],[21]   12.74% [12],[24],[28]
Spread 8.00% [14],[20],[21],[22]   8.00% [14],[20],[21],[22]   8.00% [12],[24],[28],[29]
PIK Rate 3.00% [14],[15],[20],[21]   3.00% [14],[15],[20],[21]   3.00% [12],[16],[24],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 3,684    
Ending balance [5],[14],[20],[21] $ 3,539   3,539    
Investment, Identifier [Axis]: Lightbox Holdings, L.P., Secured Debt          
Schedule of Investments [Line Items]          
Total Rate [11],[12]         9.44%
Spread [11],[12],[29]         5.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12]     5,534    
Investment, Identifier [Axis]: Logix Acquisition Company, LLC, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28],[34]         12.25%
Spread [12],[24],[28],[29],[34]         4.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[34]     $ 9,191    
Investment, Identifier [Axis]: Logix Acquisition Company, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 11.83%   11.83%    
Spread [14],[20],[21],[22] 7.50%   7.50%    
PIK Rate [14],[15],[20],[21] 2.75%   2.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 20,404   $ 20,404    
Investment, Identifier [Axis]: Logix Acquisition Company, LLC, Secured Debt 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20] 883   883    
Investment, Identifier [Axis]: MH Corbin Holding LLC, Preferred Member Units 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       (80)  
Amount of Interest, Fees or Dividends Credited to Income       0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       80  
Gross Additions       0  
Gross Reductions       80  
Ending balance   0   0  
Investment, Identifier [Axis]: MH Corbin Holding LLC, Preferred Member Units 2          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       0  
Gross Additions       0  
Gross Reductions       0  
Ending balance   $ 0   $ 0  
Investment, Identifier [Axis]: MH Corbin Holding LLC, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate   14.00%   14.00%  
Amount of Realized Gain/(Loss)       $ 0  
Amount of Unrealized Gain/(Loss)       (871)  
Amount of Interest, Fees or Dividends Credited to Income       139  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       1,256  
Gross Additions       0  
Gross Reductions       911  
Ending balance   $ 345   345  
Investment, Identifier [Axis]: Mako Steel, LP, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread [12],[24],[28],[29],[30]         7.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     0    
Investment, Identifier [Axis]: Mako Steel, LP, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         12.00%
Spread [12],[24],[28],[29]         7.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     21,081    
Investment, Identifier [Axis]: Metalforming Holdings, LLC, Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     500    
Ending balance [5],[14],[26] $ 700   $ 700    
Investment, Identifier [Axis]: Metalforming Holdings, LLC, Preferred Equity          
Schedule of Investments [Line Items]          
Total Rate 8.00% [14],[26]   8.00% [14],[26]   8.00% [12],[25]
PIK Rate 8.00% [14],[15],[26]   8.00% [14],[15],[26]   8.00% [12],[16],[25]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[25]     $ 470    
Ending balance [5],[14],[26] $ 434   434    
Investment, Identifier [Axis]: Metalforming Holdings, LLC, Secured Debt 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[30]     0    
Ending balance [5],[14],[23] $ 0   $ 0    
Investment, Identifier [Axis]: Metalforming Holdings, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 8.75% [14]   8.75% [14]   9.75% [12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     $ 1,513    
Ending balance [5],[14] $ 1,306   $ 1,306    
Investment, Identifier [Axis]: Microbe Formulas, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 5.75% [14],[20],[21],[22],[23]   5.75% [14],[20],[21],[22],[23]   5.75% [12],[24],[28],[29],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     $ (5)    
Ending balance [5],[14],[20],[21],[23] $ (3)   $ (3)    
Investment, Identifier [Axis]: Microbe Formulas, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.01% [14],[20],[21]   10.01% [14],[20],[21]   10.22% [12],[24],[28]
Spread 5.75% [14],[20],[21],[22]   5.75% [14],[20],[21],[22]   5.75% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 1,342    
Ending balance [5],[14],[20],[21] $ 1,331   $ 1,331    
Investment, Identifier [Axis]: Microbe Formulas, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 10.01% [14],[20],[21]   10.01% [14],[20],[21]   10.21% [12],[24],[28]
Spread 5.75% [14],[20],[21],[22]   5.75% [14],[20],[21],[22]   5.75% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 2,389    
Ending balance [5],[14],[20],[21] $ 1,894   1,894    
Investment, Identifier [Axis]: Mills Fleet Farm Group, LLC, Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     (1,925)    
Amount of Interest, Fees or Dividends Credited to Income     665    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     11,166    
Gross Additions     669    
Gross Reductions     1,925    
Ending balance [5],[10],[20],[26],[36] $ 9,910   $ 9,910    
Investment, Identifier [Axis]: Mills Fleet Farm Group, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [10],[20],[21] 9.78%   9.78%    
Spread [10],[20],[21],[22] 5.50%   5.50%    
PIK Rate 9.78%   9.78%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     150    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     2,285    
Gross Reductions     0    
Ending balance [5],[10],[20],[21] $ 2,285   $ 2,285    
Investment, Identifier [Axis]: Mills Fleet Farm Group, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [10],[20],[21] 9.70%   9.70%    
Spread [10],[20],[21],[22] 5.50%   5.50%    
PIK Rate 9.70%   9.70%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     17    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     1,349    
Gross Reductions     0    
Ending balance [5],[10],[20],[21] $ 1,349   1,349    
Investment, Identifier [Axis]: Mini Melts of America, LLC, Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     280    
Ending balance [5],[14],[20] $ 190   $ 190    
Investment, Identifier [Axis]: Mini Melts of America, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 10.47% [14],[20],[21],[27]   10.47% [14],[20],[21],[27]   10.74% [12],[24],[28],[35]
Spread 6.25% [14],[20],[21],[22],[27]   6.25% [14],[20],[21],[22],[27]   6.25% [12],[24],[28],[29],[35]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[35]     $ 375    
Ending balance [5],[14],[20],[21],[27] $ 527   $ 527    
Investment, Identifier [Axis]: Mini Melts of America, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.44% [14],[20],[21],[50]   10.44% [14],[20],[21],[50]   10.77% [12],[24],[28],[52]
Spread 6.25% [14],[20],[21],[22],[50]   6.25% [14],[20],[21],[22],[50]   6.25% [12],[24],[28],[29],[52]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[52]     $ 858    
Ending balance [5],[14],[20],[21],[50] $ 811   $ 811    
Investment, Identifier [Axis]: Mini Melts of America, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 9.45% [14],[20],[21]   9.45% [14],[20],[21]   9.76% [12],[24],[28]
Spread 5.25% [14],[20],[21],[22]   5.25% [14],[20],[21],[22]   5.25% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 3,201    
Ending balance [5],[14],[20],[21] $ 3,004   $ 3,004    
Investment, Identifier [Axis]: Mini Melts of America, LLC, Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 11.45% [14],[20],[21]   11.45% [14],[20],[21]   11.76% [12],[24],[28]
Spread 7.25% [14],[20],[21],[22]   7.25% [14],[20],[21],[22]   7.25% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 3,201    
Ending balance [5],[14],[20],[21] $ 3,004   3,004    
Investment, Identifier [Axis]: Mission Critical Group, Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20] $ 4,930   $ 4,930    
Investment, Identifier [Axis]: Mission Critical Group, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread [14],[20],[21],[22],[23] 6.00%   6.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21],[23] $ (58)   $ (58)    
Investment, Identifier [Axis]: Mission Critical Group, Secured Debt 2          
Schedule of Investments [Line Items]          
Spread [14],[20],[21],[22],[23] 6.00%   6.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21],[23] $ (69)   $ (69)    
Investment, Identifier [Axis]: Mission Critical Group, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 10.14%   10.14%    
Spread [14],[20],[21],[22] 6.00%   6.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 18,485   $ 18,485    
Investment, Identifier [Axis]: MoneyThumb Acquisition, LLC, Preferred Member Units          
Schedule of Investments [Line Items]          
Total Rate 12.00% [14],[26]   12.00% [14],[26]   12.00% [12],[25]
PIK Rate 12.00% [14],[15],[26]   12.00% [14],[15],[26]   12.00% [12],[16],[25]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[25]     $ 427    
Ending balance [5],[14],[26] $ 467   $ 467    
Investment, Identifier [Axis]: MoneyThumb Acquisition, LLC, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 14.00% [14]   14.00% [14]   14.00% [12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     $ 2,197    
Ending balance [5],[14] $ 2,081   2,081    
Investment, Identifier [Axis]: MoneyThumb Acquisition, LLC, Warrants          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[18]     148    
Ending balance [5],[14],[19] 148   148    
Investment, Identifier [Axis]: MonitorUS Holding, LLC, Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[39],[40]     226    
Ending balance [5],[14],[20],[41],[42] $ 174   $ 174    
Investment, Identifier [Axis]: MonitorUS Holding, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 10.51% [14],[20],[21],[41],[42]   10.51% [14],[20],[21],[41],[42]   11.59% [12],[24],[28],[39],[40]
Spread 6.25% [14],[20],[21],[22],[41],[42]   6.25% [14],[20],[21],[22],[41],[42]   7.00% [12],[24],[28],[29],[39],[40]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[39],[40]     $ 1,125    
Ending balance [5],[14],[20],[21],[41],[42] $ 1,271   $ 1,271    
Investment, Identifier [Axis]: MonitorUS Holding, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.51% [14],[20],[21],[41],[42]   10.51% [14],[20],[21],[41],[42]   11.59% [12],[24],[28],[39],[40]
Spread 6.25% [14],[20],[21],[22],[41],[42]   6.25% [14],[20],[21],[22],[41],[42]   7.00% [12],[24],[28],[29],[39],[40]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[39],[40]     $ 3,160    
Ending balance [5],[14],[20],[21],[41],[42] $ 3,544   $ 3,544    
Investment, Identifier [Axis]: MonitorUS Holding, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 10.51% [14],[20],[21],[41],[42]   10.51% [14],[20],[21],[41],[42]   11.59% [12],[24],[28],[39],[40]
Spread 6.25% [14],[20],[21],[22],[41],[42]   6.25% [14],[20],[21],[22],[41],[42]   7.00% [12],[24],[28],[29],[39],[40]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[39],[40]     $ 5,213    
Ending balance [5],[14],[20],[21],[41],[42] $ 5,176   $ 5,176    
Investment, Identifier [Axis]: MonitorUS Holding, LLC, Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21],[41],[42] 10.51%   10.51%    
Spread [14],[20],[21],[22],[41],[42] 6.25%   6.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21],[41],[42] $ 353   $ 353    
Investment, Identifier [Axis]: MonitorUS Holding, LLC, Unsecured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 8.00% [14],[20],[41],[42]   8.00% [14],[20],[41],[42]   8.00% [12],[24],[39],[40]
PIK Rate 8.00% [14],[15],[20],[41],[42]   8.00% [14],[15],[20],[41],[42]   8.00% [12],[16],[24],[39],[40]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[39],[40]     $ 34    
Ending balance [5],[14],[20],[41],[42] $ 33   $ 33    
Investment, Identifier [Axis]: MonitorUS Holding, LLC, Unsecured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 8.00% [14],[20],[41],[42]   8.00% [14],[20],[41],[42]   8.00% [12],[24],[39],[40]
PIK Rate 8.00% [14],[15],[20],[41],[42]   8.00% [14],[15],[20],[41],[42]   8.00% [12],[16],[24],[39],[40]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[39],[40]     $ 15    
Ending balance [5],[14],[20],[41],[42] $ 23   23    
Investment, Identifier [Axis]: MonitorUS Holding, LLC, Unsecured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[39],[40]         8.00%
PIK Rate [12],[16],[24],[39],[40]         8.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[39],[40]     31    
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC, Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9],[24],[37]     11,166    
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC, Common Stock          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     110 (68)  
Amount of Interest, Fees or Dividends Credited to Income     716 735  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     6,590 [2],[9],[25] 6,598  
Gross Additions     110 0  
Gross Reductions     0 68  
Ending balance 6,700 [5],[10],[26] 6,530 6,700 [5],[10],[26] 6,530  
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     1 1  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [2],[9],[30] 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance $ 0 [5],[10],[23] $ 0 $ 0 [5],[10],[23] $ 0  
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.00% [10] 10.00% 10.00% [10] 10.00% 10.00% [9]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (1) 4  
Amount of Interest, Fees or Dividends Credited to Income     110 110  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,436 [2],[9] 1,436  
Gross Additions     1 0  
Gross Reductions     1 0  
Ending balance $ 1,436 [5],[10] $ 1,436 1,436 [5],[10] 1,436  
Investment, Identifier [Axis]: Nello Industries Investco, LLC, Common Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       55  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       0  
Gross Additions       3,030  
Gross Reductions       0  
Ending balance   $ 3,030   $ 3,030  
Investment, Identifier [Axis]: Nello Industries Investco, LLC, Preferred Stock          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     58    
Amount of Unrealized Gain/(Loss)     1,410    
Amount of Interest, Fees or Dividends Credited to Income     438    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     3,890    
Gross Additions     1,469    
Gross Reductions     289    
Ending balance $ 5,070   $ 5,070    
Investment, Identifier [Axis]: Nello Industries Investco, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.50% 13.50% 12.50% 13.50%  
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     722 293  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     6,619 0  
Gross Additions     631 6,609  
Gross Reductions     0 0  
Ending balance $ 7,250 $ 6,609 7,250 $ 6,609  
Investment, Identifier [Axis]: Nello Industries Investco, LLC, Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9],[25]     3,890    
Investment, Identifier [Axis]: Nello Industries Investco, LLC, Preferred Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[26] $ 5,070   $ 5,070    
Investment, Identifier [Axis]: Nello Industries Investco, LLC, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate [10] 12.50%   12.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10] $ 7,250   $ 7,250    
Investment, Identifier [Axis]: Nello Industries Investco, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate   11.75%   11.75%  
Spread 6.50% 6.50% 6.50% 6.50% 6.50% [9],[28],[29],[30]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     12 126  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     (12) [2],[9],[28],[30] 0  
Gross Additions     12 4,188  
Gross Reductions     0 600  
Ending balance $ 0 $ 3,588 0 3,588  
Investment, Identifier [Axis]: Nello Industries Investco, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [9]         13.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9]     6,619    
Investment, Identifier [Axis]: NexRev LLC, Preferred Member Units          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     90 870  
Amount of Interest, Fees or Dividends Credited to Income     113 161  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     2,970 [2],[9],[25] 1,590  
Gross Additions     90 870  
Gross Reductions     0 0  
Ending balance 3,060 [5],[10],[26] $ 2,460 3,060 [5],[10],[26] $ 2,460  
Investment, Identifier [Axis]: NexRev LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate   10.00%   10.00%  
Amount of Realized Gain/(Loss)     0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     0 25  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [2],[9] 0  
Gross Additions     0 790  
Gross Reductions     0 300  
Ending balance 0 $ 490 0 $ 490  
Investment, Identifier [Axis]: NexRev LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate   10.00%   10.00% 9.00% [9]
Amount of Realized Gain/(Loss)     0 $ 0  
Amount of Unrealized Gain/(Loss)     (3) 6  
Amount of Interest, Fees or Dividends Credited to Income     38 198  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     2,453 [2],[9] 2,435  
Gross Additions     3 18  
Gross Reductions     2,456 0  
Ending balance 0 $ 2,453 0 2,453  
Investment, Identifier [Axis]: NinjaTrader, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread [12],[24],[28],[29],[30]         6.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     (3)    
Investment, Identifier [Axis]: NinjaTrader, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         11.24%
Spread [12],[24],[28],[29]         6.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     14,436    
Investment, Identifier [Axis]: NuStep, LLC, Preferred Member Units 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9]     1,500    
Ending balance [5],[10] 1,500   1,500    
Investment, Identifier [Axis]: NuStep, LLC, Preferred Member Units 1.1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     160 92  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     2,890 2,310  
Gross Additions     160 350  
Gross Reductions     0 0  
Ending balance 3,050 2,660 3,050 2,660  
Investment, Identifier [Axis]: NuStep, LLC, Preferred Member Units 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9]     2,890    
Ending balance [5],[10] 3,050   3,050    
Investment, Identifier [Axis]: NuStep, LLC, Preferred Member Units 2.1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 20  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,500 1,290  
Gross Additions     0 150  
Gross Reductions     0 0  
Ending balance $ 1,500 $ 1,440 $ 1,500 $ 1,440  
Investment, Identifier [Axis]: NuStep, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 10.91% [10],[21],[47] 11.85% 10.91% [10],[21],[47] 11.85% 11.16% [9],[28]
Spread 6.50% [10],[21],[22],[47] 6.50% 6.50% [10],[21],[22],[47] 6.50% 6.50% [9],[28],[29]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     70 83  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     900 [2],[9],[28] 899  
Gross Additions     0 1  
Gross Reductions     350 0  
Ending balance $ 550 [5],[10],[21],[47] $ 900 $ 550 [5],[10],[21],[47] $ 900  
Investment, Identifier [Axis]: NuStep, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.00% [10],[47] 12.00% 12.00% [10],[47] 12.00% 12.00% [9]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     420 424  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     4,610 [2],[9] 4,606  
Gross Additions     0 3  
Gross Reductions     0 0  
Ending balance $ 4,610 [5],[10],[47] $ 4,609 $ 4,610 [5],[10],[47] 4,609  
Investment, Identifier [Axis]: Obra Capital, Inc., Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 7.25% [14],[20],[21],[22],[23]   7.25% [14],[20],[21],[22],[23]   7.50% [12],[24],[28],[29],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     $ (14)    
Ending balance [5],[14],[20],[21],[23] $ (11)   $ (11)    
Investment, Identifier [Axis]: Obra Capital, Inc., Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.50% [14],[20],[21]   11.50% [14],[20],[21]   11.97% [12],[24],[28]
Spread 7.25% [14],[20],[21],[22]   7.25% [14],[20],[21],[22]   7.50% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 11,766    
Ending balance [5],[14],[20],[21] $ 11,889   $ 11,889    
Investment, Identifier [Axis]: Obra Capital, Inc., Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 11.50%   11.50%    
Spread [14],[20],[21],[22] 7.25%   7.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 1,352   $ 1,352    
Investment, Identifier [Axis]: OnPoint Industrial Services, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 10.00% [14],[20],[21]   10.00% [14],[20],[21]   11.35% [12],[24],[28]
Spread 6.00% [14],[20],[21],[22]   6.00% [14],[20],[21],[22]   7.00% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 1,040    
Ending balance [5],[14],[20],[21] $ 1,042   $ 1,042    
Investment, Identifier [Axis]: OnPoint Industrial Services, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.00% [14],[20],[21]   10.00% [14],[20],[21]   11.33% [12],[24],[28]
Spread 6.00% [14],[20],[21],[22]   6.00% [14],[20],[21],[22]   7.00% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 2,888    
Ending balance [5],[14],[20],[21] $ 2,896   2,896    
Investment, Identifier [Axis]: Oneliance, LLC, Preferred Stock          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     170 268  
Amount of Interest, Fees or Dividends Credited to Income     14 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     640 [2],[9] 282  
Gross Additions     170 268  
Gross Reductions     0 0  
Ending balance 810 [5],[10],[26] $ 550 810 [5],[10],[26] $ 550  
Investment, Identifier [Axis]: Oneliance, LLC, Secured Debt          
Schedule of Investments [Line Items]          
Spread   10.00%   10.00%  
Amount of Realized Gain/(Loss)       $ 0  
Amount of Unrealized Gain/(Loss)       7  
Amount of Interest, Fees or Dividends Credited to Income       142  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       1,339  
Gross Additions       21  
Gross Reductions       1,360  
Ending balance   $ 0   0  
Investment, Identifier [Axis]: Orttech Holdings, LLC, Preferred Stock          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 (590)  
Amount of Interest, Fees or Dividends Credited to Income     45 97  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     3,360 [2],[9],[25],[37] 4,260  
Gross Additions     0 0  
Gross Reductions     0 590  
Ending balance $ 3,360 [5],[10],[36] $ 3,670 $ 3,360 [5],[10],[36] $ 3,670  
Investment, Identifier [Axis]: Orttech Holdings, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 11.00% [10],[21],[22],[23] 11.00% 11.00% [10],[21],[22],[23] 11.00% 11.00% [9],[28],[29],[30]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (1) (1)  
Amount of Interest, Fees or Dividends Credited to Income     1 1  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [2],[9],[28],[30] 0  
Gross Additions     1 1  
Gross Reductions     1 1  
Ending balance $ 0 [5],[10],[21],[23] $ 0 $ 0 [5],[10],[21],[23] $ 0  
Investment, Identifier [Axis]: Orttech Holdings, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 15.41% [10],[21] 16.35% 15.41% [10],[21] 16.35% 15.66% [9],[28]
Spread 11.00% [10],[21],[22] 11.00% 11.00% [10],[21],[22] 11.00% 11.00% [9],[28],[29]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (18) (17)  
Amount of Interest, Fees or Dividends Credited to Income     643 705  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     5,490 [2],[9],[28] 5,510  
Gross Additions     18 17  
Gross Reductions     318 37  
Ending balance $ 5,190 [5],[10],[21] $ 5,490 5,190 [5],[10],[21] 5,490  
Investment, Identifier [Axis]: Other Amounts related to investments transferred to or from other 1940 Act classification during the period, Affiliate Investments          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     (3,611) 0  
Amount of Interest, Fees or Dividends Credited to Income     (44) 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     (7,914) (12,834)  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance 0 0 0 0  
Investment, Identifier [Axis]: Other Amounts related to investments transferred to or from other 1940 Act classification during the period, Control Investments          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance $ 0 0 $ 0 0  
Investment, Identifier [Axis]: PTL US Bidco, Inc, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 11.75% [14],[20],[21],[27],[41],[42]   11.75% [14],[20],[21],[27],[41],[42]   13.03% [12],[24],[28],[39],[40]
Spread 7.25% [14],[20],[21],[22],[27],[41],[42]   7.25% [14],[20],[21],[22],[27],[41],[42]   8.25% [12],[24],[28],[29],[39],[40]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[39],[40]     $ 443    
Ending balance [5],[14],[20],[21],[27],[41],[42] $ 448   $ 448    
Investment, Identifier [Axis]: PTL US Bidco, Inc, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.71% [14],[20],[21],[41],[42]   11.71% [14],[20],[21],[41],[42]   13.03% [12],[24],[28],[39],[40]
Spread 7.25% [14],[20],[21],[22],[41],[42]   7.25% [14],[20],[21],[22],[41],[42]   8.25% [12],[24],[28],[29],[39],[40]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[39],[40]     $ 1,155    
Ending balance [5],[14],[20],[21],[41],[42] $ 1,026   1,026    
Investment, Identifier [Axis]: Paragon Healthcare, Inc., Secured Debt 2          
Schedule of Investments [Line Items]          
Spread         11.75%
Investment, Identifier [Axis]: Peaches Holding Corporation, Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     1,140    
Ending balance [5],[14] 0   0    
Investment, Identifier [Axis]: Pinnacle TopCo, LLC, Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     330 1,205  
Amount of Interest, Fees or Dividends Credited to Income     348 430  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     4,590 [2],[9],[25] 3,135  
Gross Additions     330 1,205  
Gross Reductions     0 0  
Ending balance 4,920 [5],[10],[26] 4,340 4,920 [5],[10],[26] 4,340  
Investment, Identifier [Axis]: Pinnacle TopCo, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     (1) 8  
Amount of Interest, Fees or Dividends Credited to Income     3 4  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [2],[9],[30] 105  
Gross Additions     1 10  
Gross Reductions     1 115  
Ending balance $ 0 [5],[10],[23] $ 0 $ 0 [5],[10],[23] $ 0  
Investment, Identifier [Axis]: Pinnacle TopCo, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 13.00% [10] 13.00% 13.00% [10] 13.00% 13.00% [9]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (29) 152  
Amount of Interest, Fees or Dividends Credited to Income     725 783  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     7,160 [2],[9] 7,472  
Gross Additions     29 188  
Gross Reductions     229 400  
Ending balance $ 6,960 [5],[10] $ 7,260 6,960 [5],[10] 7,260  
Investment, Identifier [Axis]: Power System Solutions, Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     1,640    
Investment, Identifier [Axis]: Power System Solutions, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread [12],[24],[28],[29],[30]         6.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     (27)    
Investment, Identifier [Axis]: Power System Solutions, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         10.86%
Spread [12],[24],[28],[29]         6.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     2,640    
Investment, Identifier [Axis]: Power System Solutions, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         10.90%
Spread [12],[24],[28],[29]         6.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 7,859    
Investment, Identifier [Axis]: PrimeFlight Aviation Services, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 9.80% [14],[20],[21],[41]   9.80% [14],[20],[21],[41]   10.58% [12],[24],[28]
Spread 5.50% [14],[20],[21],[22],[41]   5.50% [14],[20],[21],[22],[41]   5.50% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 5,910    
Ending balance [5],[14],[20],[21],[41] $ 5,865   $ 5,865    
Investment, Identifier [Axis]: PrimeFlight Aviation Services, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.50% [14],[20],[21],[41]   9.50% [14],[20],[21],[41]   9.83% [12],[24],[28]
Spread 5.50% [14],[20],[21],[22],[41]   5.50% [14],[20],[21],[22],[41]   5.50% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 564    
Ending balance [5],[14],[20],[21],[41] $ 560   $ 560    
Investment, Identifier [Axis]: PrimeFlight Aviation Services, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 9.50% [14],[20],[21],[41]   9.50% [14],[20],[21],[41]   9.83% [12],[24],[28]
Spread 5.50% [14],[20],[21],[22],[41]   5.50% [14],[20],[21],[22],[41]   5.50% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 567    
Ending balance [5],[14],[20],[21],[41] $ 563   $ 563    
Investment, Identifier [Axis]: PrimeFlight Aviation Services, Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 9.25% [14],[20],[21],[41]   9.25% [14],[20],[21],[41]   9.58% [12],[24],[28]
Spread 5.25% [14],[20],[21],[22],[41]   5.25% [14],[20],[21],[22],[41]   5.25% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 644    
Ending balance [5],[14],[20],[21],[41] $ 640   $ 640    
Investment, Identifier [Axis]: PrimeFlight Aviation Services, Secured Debt 5          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21],[41] 9.58%   9.58%    
Spread [14],[20],[21],[22],[41] 5.25%   5.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21],[41] $ 1,418   $ 1,418    
Investment, Identifier [Axis]: PrimeFlight Aviation Services, Secured Debt 6          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21],[41] 9.55%   9.55%    
Spread [14],[20],[21],[22],[41] 5.25%   5.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21],[41] $ 1,330   $ 1,330    
Investment, Identifier [Axis]: Purge Rite, LLC, Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     820    
Ending balance [5],[14],[20] 6,210   6,210    
Investment, Identifier [Axis]: Purge Rite, LLC, Preferred Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     1,289    
Ending balance [5],[14],[20] 1,289   1,289    
Investment, Identifier [Axis]: RA Outdoors LLC, Common Equity          
Schedule of Investments [Line Items]          
Spread [9],[24],[29],[39]         6.75%
PIK Rate [9],[16],[24],[39]         11.59%
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [2],[9],[24],[39] 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance $ 0 [5],[10],[20] $ 0 $ 0 [5],[10],[20] $ 0  
Investment, Identifier [Axis]: RA Outdoors LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 11.25% [10],[20],[21] 11.59% 11.25% [10],[20],[21] 11.59% 11.74% [9],[24],[28],[39]
Spread 6.75% [10],[20],[21],[22] 6.75% 6.75% [10],[20],[21],[22] 6.75% 6.75% [9],[24],[28],[29],[39]
PIK Rate 11.25% [10],[15],[20],[21] 11.59% 11.25% [10],[15],[20],[21] 11.59% 11.74% [9],[16],[24],[28],[39]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (143) (70)  
Amount of Interest, Fees or Dividends Credited to Income     114 27  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,215 [2],[9],[24],[28],[39] 745  
Gross Additions     77 481  
Gross Reductions     181 36  
Ending balance $ 1,111 [5],[10],[20],[21] $ 1,190 $ 1,111 [5],[10],[20],[21] $ 1,190  
Investment, Identifier [Axis]: RA Outdoors LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate   11.59%   11.59% 11.74% [9],[24],[28],[39]
Spread 6.75% [10],[20],[21],[22],[23] 6.75% 6.75% [10],[20],[21],[22],[23] 6.75% 6.75% [9],[24],[28],[29],[39]
PIK Rate   11.59%   11.59% 11.74% [9],[16],[24],[28],[39]
Amount of Realized Gain/(Loss)       $ 0  
Amount of Unrealized Gain/(Loss)       (737)  
Amount of Interest, Fees or Dividends Credited to Income       284  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     $ 12,710 [2],[9],[24],[28],[39] 12,089  
Gross Additions       448  
Gross Reductions       96  
Ending balance $ 0 [5],[10],[20],[21],[23] $ 12,441 $ 0 [5],[10],[20],[21],[23] 12,441  
Investment, Identifier [Axis]: RA Outdoors LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Spread [10],[20],[21],[22],[23] 6.75%   6.75%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     0    
Gross Reductions     0    
Ending balance [5],[10],[20],[21],[23] $ 0   $ 0    
Investment, Identifier [Axis]: RA Outdoors LLC, Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate [10],[20],[21] 11.25%   11.25%    
Spread [10],[20],[21],[22] 6.75%   6.75%    
PIK Rate [10],[15],[20],[21] 11.25%   11.25%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     (1,500)    
Amount of Interest, Fees or Dividends Credited to Income     1,199    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     12,710    
Gross Additions     814    
Gross Reductions     1,905    
Ending balance [5],[10],[20],[21] $ 11,619   $ 11,619    
Investment, Identifier [Axis]: RA Outdoors LLC, Secured Debt 5          
Schedule of Investments [Line Items]          
Spread [10],[20],[21],[22],[23] 6.75%   6.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[20],[21],[23] $ 0   $ 0    
Investment, Identifier [Axis]: Richardson Sales Solutions, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 10.71% [14],[20],[21],[27]   10.71% [14],[20],[21],[27]   11.22% [12],[24],[28],[35]
Spread 6.50% [14],[20],[21],[22],[27]   6.50% [14],[20],[21],[22],[27]   6.75% [12],[24],[28],[29],[35]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[35]     $ 1,075    
Ending balance [5],[14],[20],[21],[27] $ 275   $ 275    
Investment, Identifier [Axis]: Richardson Sales Solutions, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.81% [14],[20],[21]   10.81% [14],[20],[21]   11.38% [12],[24],[28]
Spread 6.50% [14],[20],[21],[22]   6.50% [14],[20],[21],[22]   6.75% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 10,288    
Ending balance [5],[14],[20],[21] $ 10,089   $ 10,089    
Investment, Identifier [Axis]: Richardson Sales Solutions, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 10.83% [14],[20],[21]   10.83% [14],[20],[21]   11.43% [12],[24],[28]
Spread 6.50% [14],[20],[21],[22]   6.50% [14],[20],[21],[22]   6.75% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 5,065    
Ending balance [5],[14],[20],[21] $ 4,969   4,969    
Investment, Identifier [Axis]: Robbins Bros. Jewelry, Inc., Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [2],[9] 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance 0 [5],[10] $ 0 0 [5],[10] $ 0  
Investment, Identifier [Axis]: Robbins Bros. Jewelry, Inc., Secured Debt 1          
Schedule of Investments [Line Items]          
PIK Rate   10.00%   10.00% 10.00% [9],[16],[30],[33]
Amount of Realized Gain/(Loss)     0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     3 1  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     (7) [2],[9],[30],[33] (6)  
Gross Additions     0 1  
Gross Reductions     5 0  
Ending balance $ (12) [5],[10],[17],[23] $ (5) $ (12) [5],[10],[17],[23] $ (5)  
Investment, Identifier [Axis]: Robbins Bros. Jewelry, Inc., Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.50% [10],[17] 12.50% 12.50% [10],[17] 12.50% 12.50% [9],[33]
PIK Rate 10.00% [10],[15],[17] 10.00% 10.00% [10],[15],[17] 10.00% 10.00% [9],[16],[33]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     17 (1,662)  
Amount of Interest, Fees or Dividends Credited to Income     0 123  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,617 [2],[9],[33] 3,421  
Gross Additions     0 5  
Gross Reductions     45 1,713  
Ending balance $ 1,572 [5],[10],[17] $ 1,713 $ 1,572 [5],[10],[17] 1,713  
Investment, Identifier [Axis]: Roof Opco, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 8.00% [14],[20],[21],[22],[23]   8.00% [14],[20],[21],[22],[23]   8.00% [12],[24],[28],[29],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     $ 0    
Ending balance [5],[14],[20],[21],[23] $ 0   $ 0    
Investment, Identifier [Axis]: Roof Opco, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.55% [14],[20],[21]   11.55% [14],[20],[21]   11.85% [12],[24],[28]
Spread 7.00% [14],[20],[21],[22]   7.00% [14],[20],[21],[22]   7.00% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 3,840    
Ending balance [5],[14],[20],[21] $ 3,164   $ 3,164    
Investment, Identifier [Axis]: Roof Opco, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 13.55% [14],[20],[21]   13.55% [14],[20],[21]   13.85% [12],[24],[28]
Spread 9.00% [14],[20],[21],[22]   9.00% [14],[20],[21],[22]   9.00% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 3,815    
Ending balance [5],[14],[20],[21] $ 3,162   $ 3,162    
Investment, Identifier [Axis]: Rug Doctor, LLC., Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 11.94% [14],[20],[21]   11.94% [14],[20],[21]   12.52% [12],[24],[28]
Spread 7.75% [14],[20],[21],[22]   7.75% [14],[20],[21],[22]   8.00% [12],[24],[28],[29]
PIK Rate 2.00% [14],[15],[20],[21]   2.00% [14],[15],[20],[21]   2.00% [12],[16],[24],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 6,542    
Ending balance [5],[14],[20],[21] $ 4,107   $ 4,107    
Investment, Identifier [Axis]: Rug Doctor, LLC., Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.94% [14],[20],[21]   11.94% [14],[20],[21]   12.52% [12],[24],[28]
Spread 7.75% [14],[20],[21],[22]   7.75% [14],[20],[21],[22]   8.00% [12],[24],[28],[29]
PIK Rate 2.00% [14],[15],[20],[21]   2.00% [14],[15],[20],[21]   2.00% [12],[16],[24],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 8,277    
Ending balance [5],[14],[20],[21] $ 7,654   7,654    
Investment, Identifier [Axis]: SI East, LLC, Preferred Member Units          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     210 (1,000)  
Amount of Interest, Fees or Dividends Credited to Income     104 665  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     4,550 6,390  
Gross Additions     210 0  
Gross Reductions     0 1,000  
Ending balance $ 4,760 [5],[10] $ 5,390 $ 4,760 [5],[10] $ 5,390  
Investment, Identifier [Axis]: SI East, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 11.85% 11.75% 11.85% 11.75%  
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (1) 0  
Amount of Interest, Fees or Dividends Credited to Income     73 64  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     750 375  
Gross Additions     1 750  
Gross Reductions     1 375  
Ending balance $ 750 $ 750 $ 750 750  
Investment, Identifier [Axis]: SI East, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.78%   12.78%    
Amount of Realized Gain/(Loss)     $ 0 0  
Amount of Unrealized Gain/(Loss)     12 (161)  
Amount of Interest, Fees or Dividends Credited to Income     2,193 947  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     22,554 18,179  
Gross Additions     0 0  
Gross Reductions     209 18,179  
Ending balance $ 22,345 $ 0 22,345 $ 0  
Investment, Identifier [Axis]: SI East, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate   12.63%   12.63%  
Amount of Realized Gain/(Loss)       $ 0  
Amount of Unrealized Gain/(Loss)       22  
Amount of Interest, Fees or Dividends Credited to Income       1,213  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       0  
Gross Additions       22,554  
Gross Reductions       0  
Ending balance   $ 22,554   22,554  
Investment, Identifier [Axis]: SI East, LLC, Preferred Member Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9],[25]     $ 4,550    
Investment, Identifier [Axis]: SI East, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 11.85% [10]   11.85% [10]   11.75% [9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9]     $ 750    
Ending balance [5],[10] $ 750   $ 750    
Investment, Identifier [Axis]: SI East, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.78% [10],[53]   12.78% [10],[53]   12.79% [9],[54]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9],[54]     $ 22,554    
Ending balance [5],[10],[53] $ 22,345   22,345    
Investment, Identifier [Axis]: SPAU Holdings, LLC, Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     190    
Ending balance [5],[14],[20] $ 200   $ 200    
Investment, Identifier [Axis]: SPAU Holdings, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21],[27] 11.24%   11.24%    
Spread 7.00% [14],[20],[21],[22],[27]   7.00% [14],[20],[21],[22],[27]   7.50% [12],[24],[28],[29],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     $ 0    
Ending balance [5],[14],[20],[21],[27] $ 1,000   $ 1,000    
Investment, Identifier [Axis]: SPAU Holdings, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.15% [14],[20],[21]   11.15% [14],[20],[21]   11.98% [12],[24],[28]
Spread 7.00% [14],[20],[21],[22]   7.00% [14],[20],[21],[22]   7.50% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 4,875    
Ending balance [5],[14],[20],[21] $ 4,837   4,837    
Investment, Identifier [Axis]: Slick Innovations, LLC, Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[25]     630    
Ending balance [5],[14],[26] $ 520   $ 520    
Investment, Identifier [Axis]: Slick Innovations, LLC, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 14.00% [14]   14.00% [14]   14.00% [12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     $ 4,080    
Ending balance [5],[14] $ 6,270   6,270    
Investment, Identifier [Axis]: South Coast Terminals Holdings, LLC, Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     62    
Ending balance [5],[14],[20] $ 66   $ 66    
Investment, Identifier [Axis]: South Coast Terminals Holdings, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 9.26%   9.26%    
Spread 5.00% [14],[20],[21],[22]   5.00% [14],[20],[21],[22]   5.25% [12],[24],[28],[29],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     $ 0    
Ending balance [5],[14],[20],[21] $ 595   $ 595    
Investment, Identifier [Axis]: South Coast Terminals Holdings, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.26% [14],[20],[21]   9.26% [14],[20],[21]   9.71% [12],[24],[28]
Spread 5.00% [14],[20],[21],[22]   5.00% [14],[20],[21],[22]   5.25% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 4,388    
Ending balance [5],[14],[20],[21] $ 33,214   $ 33,214    
Investment, Identifier [Axis]: South Coast Terminals Holdings, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 9.26%   9.26%    
Spread [14],[20],[21],[22] 5.00%   5.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 6,542   $ 6,542    
Investment, Identifier [Axis]: Student Resource Center, LLC, Preferred Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[20] 0   0    
Investment, Identifier [Axis]: Student Resource Center, LLC, Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [2],[9],[24] 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance $ 0 $ 0 $ 0 $ 0  
Investment, Identifier [Axis]: Student Resource Center, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 8.50% [10],[20]   8.50% [10],[20]   8.50% [9],[24]
PIK Rate 8.50% [10],[15],[20]   8.50% [10],[15],[20]   8.50% [9],[16],[24]
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     620    
Amount of Interest, Fees or Dividends Credited to Income     14    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9],[24]     227    
Gross Additions     634    
Gross Reductions     0    
Ending balance [5],[10],[20] $ 861   $ 861    
Investment, Identifier [Axis]: Student Resource Center, LLC, Secured Debt 1.1          
Schedule of Investments [Line Items]          
Total Rate   8.50%   8.50%  
PIK Rate   8.50%   8.50%  
Amount of Realized Gain/(Loss)       $ 0  
Amount of Unrealized Gain/(Loss)       (1,717)  
Amount of Interest, Fees or Dividends Credited to Income       0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       3,543  
Gross Additions       0  
Gross Reductions       1,717  
Ending balance   $ 1,826   $ 1,826  
Investment, Identifier [Axis]: Student Resource Center, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 8.50% [10],[17],[20]   8.50% [10],[17],[20]   8.50% [9],[24],[33]
PIK Rate 8.50% [10],[15],[17],[20]   8.50% [10],[15],[17],[20]   8.50% [9],[16],[24],[33]
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     (331)    
Amount of Interest, Fees or Dividends Credited to Income     0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9],[24],[33]     1,826    
Gross Additions     0    
Gross Reductions     331    
Ending balance [5],[10],[17],[20] $ 1,495   $ 1,495    
Investment, Identifier [Axis]: Student Resource Center, LLC, Secured Debt 2.1          
Schedule of Investments [Line Items]          
Total Rate   8.50%   8.50%  
PIK Rate   8.50%   8.50%  
Amount of Realized Gain/(Loss)       $ 0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       1  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       0  
Gross Additions       223  
Gross Reductions       0  
Ending balance   $ 223   223  
Investment, Identifier [Axis]: TEC Services, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 5.50% [14],[20],[21],[22],[23]   5.50% [14],[20],[21],[22],[23]   5.75% [12],[24],[28],[29],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     $ (7)    
Ending balance [5],[14],[20],[21],[23] $ (6)   $ (6)    
Investment, Identifier [Axis]: TEC Services, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Spread 5.50% [14],[20],[21],[22],[23]   5.50% [14],[20],[21],[22],[23]   5.75% [12],[24],[28],[29],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     $ (5)    
Ending balance [5],[14],[20],[21],[23] $ (4)   $ (4)    
Investment, Identifier [Axis]: TEC Services, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 9.60% [14],[20],[21]   9.60% [14],[20],[21]   10.13% [12],[24],[28]
Spread 5.50% [14],[20],[21],[22]   5.50% [14],[20],[21],[22]   5.75% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 2,299    
Ending balance [5],[14],[20],[21] $ 2,301   2,301    
Investment, Identifier [Axis]: Tedder Industries, LLC, Preferred Member Units 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10] 0   0    
Investment, Identifier [Axis]: Tedder Industries, LLC, Preferred Member Units 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10] 0   0    
Investment, Identifier [Axis]: Tedder Industries, LLC, Preferred Member Units 3          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10] $ 0   $ 0    
Investment, Identifier [Axis]: Tedder Industries, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [10],[17],[47] 12.00%   12.00%    
PIK Rate [10],[15],[17],[47] 12.00%   12.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[17],[47] $ 227   $ 227    
Investment, Identifier [Axis]: Tedder Industries, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [10],[17],[47] 12.00%   12.00%    
PIK Rate [10],[15],[17],[47] 12.00%   12.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[10],[17],[47] $ 641   $ 641    
Investment, Identifier [Axis]: Tedder Industries, LLC, Preferred Member Units 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [2],[9] 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance 0 0 0 0  
Investment, Identifier [Axis]: Tedder Industries, LLC, Preferred Member Units 2          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [2],[9] 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance 0 0 0 0  
Investment, Identifier [Axis]: Tedder Industries, LLC, Preferred Member Units 3          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [2],[9] 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance $ 0 $ 0 $ 0 $ 0  
Investment, Identifier [Axis]: Tedder Industries, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 12.00% 12.00% 12.00% 12.00% 12.00% [9],[33],[34]
PIK Rate 12.00% 12.00% 12.00% 12.00% 12.00% [9],[16],[33],[34]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     56 0  
Amount of Interest, Fees or Dividends Credited to Income     0 14  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     412 [2],[9],[33],[34] 432  
Gross Additions     0 0  
Gross Reductions     185 0  
Ending balance $ 227 $ 432 $ 227 $ 432  
Investment, Identifier [Axis]: Tedder Industries, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.00% 12.00% 12.00% 12.00% 12.00% [9],[33],[34]
PIK Rate 12.00% 12.00% 12.00% 12.00% 12.00% [9],[16],[33],[34]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (260) (2,401)  
Amount of Interest, Fees or Dividends Credited to Income     0 115  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     901 [2],[9],[33],[34] 3,565  
Gross Additions     0 0  
Gross Reductions     260 2,401  
Ending balance $ 641 $ 1,164 641 1,164  
Investment, Identifier [Axis]: Tex Tech Tennis, LLC, Preferred Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[37]     2,290    
Ending balance [5],[14],[20],[36] 2,620   2,620    
Investment, Identifier [Axis]: The Affiliati Network, LLC, Preferred Stock 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[25]     72    
Ending balance [5],[14] 78   78    
Investment, Identifier [Axis]: The Affiliati Network, LLC, Preferred Stock 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[25]     1,600    
Ending balance [5],[14],[26] $ 1,600   $ 1,600    
Investment, Identifier [Axis]: The Affiliati Network, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 10.00% [14]   10.00% [14]   10.00% [12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     $ 98    
Ending balance [5],[14] $ 139   $ 139    
Investment, Identifier [Axis]: The Affiliati Network, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.00% [14]   10.00% [14]   10.00% [12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     $ 1,274    
Ending balance [5],[14] $ 1,163   $ 1,163    
Investment, Identifier [Axis]: Titan Meter Midco Corp., Preferred Equity          
Schedule of Investments [Line Items]          
Total Rate 8.00% [14],[20]   8.00% [14],[20]   8.00% [12],[24]
PIK Rate 8.00% [14],[15],[20]   8.00% [14],[15],[20]   8.00% [12],[16],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     $ 540    
Ending balance [5],[14],[20] $ 540   $ 540    
Investment, Identifier [Axis]: Titan Meter Midco Corp., Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 10.50%   10.50%    
Spread 6.50% [14],[20],[21],[22]   6.50% [14],[20],[21],[22]   6.50% [12],[24],[29],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[30]     $ (40)    
Ending balance [5],[14],[20],[21] $ 554   $ 554    
Investment, Identifier [Axis]: Titan Meter Midco Corp., Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.50% [14],[20],[21]   10.50% [14],[20],[21]   10.83% [12],[24],[28]
Spread 6.50% [14],[20],[21],[22]   6.50% [14],[20],[21],[22]   6.50% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 13,049    
Ending balance [5],[14],[20],[21] $ 12,950   $ 12,950    
Investment, Identifier [Axis]: Titan Meter Midco Corp., Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 10.50%   10.50%    
Spread [14],[20],[21],[22] 6.50%   6.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 1,657   $ 1,657    
Investment, Identifier [Axis]: Titan Meter Midco Corp., Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 10.50%   10.50%    
Spread [14],[20],[21],[22] 6.50%   6.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 1,875   $ 1,875    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC, Common Stock          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     1,200 (800)  
Amount of Interest, Fees or Dividends Credited to Income     22 22  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     2,140 [2],[9],[25] 3,180  
Gross Additions     1,200 0  
Gross Reductions     0 800  
Ending balance 3,340 [5],[10],[26] 2,380 3,340 [5],[10],[26] 2,380  
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       1  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     (1) [2],[9],[30] 0  
Gross Additions       0  
Gross Reductions       0  
Ending balance 0 [5],[10],[23] $ 0 0 [5],[10],[23] $ 0  
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC, Secured Debt 1a          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     0    
Gross Reductions     0    
Ending balance $ 0   $ 0    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 13.50% [10] 13.50% 13.50% [10] 13.50% 13.50% [9]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 15  
Amount of Interest, Fees or Dividends Credited to Income     208 204  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,962 [2],[9] 1,980  
Gross Additions     5 0  
Gross Reductions     0 0  
Ending balance $ 1,967 [5],[10] $ 1,980 $ 1,967 [5],[10] 1,980  
Investment, Identifier [Axis]: U.S. TelePacific Corp., Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 11.72% [13],[14],[17],[21]   11.72% [13],[14],[17],[21]   11.90% [11],[12],[28],[33]
Spread 7.40% [13],[14],[17],[21],[22]   7.40% [13],[14],[17],[21],[22]   7.40% [11],[12],[28],[29],[33]
PIK Rate 6.25% [13],[14],[15],[17],[21]   6.25% [13],[14],[15],[17],[21]   6.00% [11],[12],[16],[28],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12],[28],[33]     $ 2,686    
Ending balance [5],[13],[14],[17],[21] $ 2,730   2,730    
Investment, Identifier [Axis]: U.S. TelePacific Corp., Secured Debt 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12],[33]     0    
Ending balance [5],[13],[14],[17] 0   0    
Investment, Identifier [Axis]: UPS Intermediate, LLC, Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     412    
Ending balance [5],[14],[20] $ 440   $ 440    
Investment, Identifier [Axis]: UPS Intermediate, LLC, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 10.41% [14],[20],[21]   10.41% [14],[20],[21]   10.36% [12],[24],[28]
Spread 6.25% [14],[20],[21],[22]   6.25% [14],[20],[21],[22]   6.00% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 19,294    
Ending balance [5],[14],[20],[21] $ 19,197   $ 19,197    
Investment, Identifier [Axis]: Urgent DSO LLC, Preferred Equity          
Schedule of Investments [Line Items]          
Total Rate 9.00% [10],[26]   9.00% [10],[26]   9.00% [9],[25]
PIK Rate 9.00% [10],[15],[26]   9.00% [10],[15],[26]   9.00% [9],[16],[25]
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     74    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9],[25]     1,080    
Gross Additions     74    
Gross Reductions     0    
Ending balance [5],[10],[26] $ 1,154   $ 1,154    
Investment, Identifier [Axis]: Urgent DSO LLC, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 13.50% [10]   13.50% [10]   13.50% [9]
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     235    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9]     2,145    
Gross Additions     10    
Gross Reductions     0    
Ending balance [5],[10] $ 2,155   $ 2,155    
Investment, Identifier [Axis]: UserZoom Technologies, Inc., Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 11.63% [14],[20],[21]   11.63% [14],[20],[21]   12.75% [12],[24],[28]
Spread 7.50% [14],[20],[21],[22]   7.50% [14],[20],[21],[22]   7.50% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 3,000    
Ending balance [5],[14],[20],[21] $ 3,000   3,000    
Investment, Identifier [Axis]: VORTEQ Coil Finishers, LLC, Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[25]     1,950    
Ending balance [5],[14],[20],[26] 2,340   2,340    
Investment, Identifier [Axis]: VVS Holdco LLC, Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     25 80  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     3,060 [2],[9],[25],[37] 3,060  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance $ 3,060 [5],[10],[26],[36] $ 3,060 $ 3,060 [5],[10],[26],[36] $ 3,060  
Investment, Identifier [Axis]: VVS Holdco LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 6.00% [10],[21],[22],[23] 6.00% 6.00% [10],[21],[22],[23] 6.00% 6.00% [9],[28],[29],[30]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     3 3  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [2],[9],[28],[30] 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance $ 0 [5],[10],[21],[23] $ 0 $ 0 [5],[10],[21],[23] $ 0  
Investment, Identifier [Axis]: VVS Holdco LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.50% [10] 11.50% 11.50% [10] 11.50% 11.50% [9]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     577 638  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     6,366 [2],[9] 6,926  
Gross Additions     31 36  
Gross Reductions     320 290  
Ending balance $ 6,077 [5],[10] $ 6,672 6,077 [5],[10] 6,672  
Investment, Identifier [Axis]: Victory Energy Operations, LLC, Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     61    
Amount of Interest, Fees or Dividends Credited to Income     69    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9]     3,644    
Gross Additions     61    
Gross Reductions     35    
Ending balance [5],[10],[26] 3,670   3,670    
Investment, Identifier [Axis]: Victory Energy Operations, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     10    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9],[30]     (5)    
Gross Additions     273    
Gross Reductions     277    
Ending balance [5],[10],[23] $ (9)   $ (9)    
Investment, Identifier [Axis]: Victory Energy Operations, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 13.00% [10]   13.00% [10]   13.00% [9]
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     799    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[9]     7,529    
Gross Additions     34    
Gross Reductions     0    
Ending balance [5],[10] $ 7,563   $ 7,563    
Investment, Identifier [Axis]: Vitesse Systems, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 11.28% [14],[20],[27]   11.28% [14],[20],[27]   11.55% [12],[24]
Spread 7.00% [14],[20],[22],[27]   7.00% [14],[20],[22],[27]   7.00% [12],[24],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     $ 1,705    
Ending balance [5],[14],[20],[27] $ 2,273   $ 2,273    
Investment, Identifier [Axis]: Vitesse Systems, Secured Debt 1, Secured Overnight Financing Rate          
Schedule of Investments [Line Items]          
Spread 4.00%   4.00%    
Investment, Identifier [Axis]: Vitesse Systems, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.26% [14],[20],[21]   11.26% [14],[20],[21]   11.47% [12],[24],[28]
Spread 7.00% [14],[20],[21],[22]   7.00% [14],[20],[21],[22]   7.00% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 12,375    
Ending balance [5],[14],[20],[21] $ 12,281   12,281    
Investment, Identifier [Axis]: Volusion, LLC, Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[8] 0   0    
Investment, Identifier [Axis]: Volusion, LLC, Preferred Member Units 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[8] 1,578   1,578    
Investment, Identifier [Axis]: Volusion, LLC, Preferred Member Units 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[8] 0   0    
Investment, Identifier [Axis]: Volusion, LLC, Preferred Member Units 3          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[8] $ 0   $ 0    
Investment, Identifier [Axis]: Volusion, LLC, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate [8],[47] 10.00%   10.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[8],[47] $ 900   $ 900    
Investment, Identifier [Axis]: Volusion, LLC, Common Stock          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [2],[7] 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance 0 0 0 0  
Investment, Identifier [Axis]: Volusion, LLC, Preferred Member Units 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[7]     3,004    
Investment, Identifier [Axis]: Volusion, LLC, Preferred Member Units 1.1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance 0 0 0 0  
Investment, Identifier [Axis]: Volusion, LLC, Preferred Member Units 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[7]     0    
Investment, Identifier [Axis]: Volusion, LLC, Preferred Member Units 2.1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     10 0  
Amount of Unrealized Gain/(Loss)     (694) 1,895  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     3,004 3,110  
Gross Additions     9 1,895  
Gross Reductions     1,435 1,805  
Ending balance 1,578 3,200 1,578 3,200  
Investment, Identifier [Axis]: Volusion, LLC, Preferred Member Units 3          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [2],[7] 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance $ 0 $ 0 $ 0 $ 0  
Investment, Identifier [Axis]: Volusion, LLC, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 10.00% 10.00% 10.00% 10.00% 10.00% [7]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     68 69  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     900 [2],[7] 900  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance $ 900 $ 900 900 $ 900  
Investment, Identifier [Axis]: Wall Street Prep, Inc., Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     1,510    
Investment, Identifier [Axis]: Wall Street Prep, Inc., Secured Debt 1          
Schedule of Investments [Line Items]          
Spread [12],[24],[28],[29],[30]         7.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28],[30]     (3)    
Investment, Identifier [Axis]: Wall Street Prep, Inc., Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         11.74%
Spread [12],[24],[28],[29]         7.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     2,199    
Investment, Identifier [Axis]: Wash & Wax Systems LLC, Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20] $ 430   $ 430    
Investment, Identifier [Axis]: Wash & Wax Systems LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 9.81%   9.81%    
Spread [14],[20],[21],[22] 5.50%   5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 1   $ 1    
Investment, Identifier [Axis]: Wash & Wax Systems LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 9.78%   9.78%    
Spread [14],[20],[21],[22] 5.50%   5.50%    
PIK Rate [14],[15],[20] 9.78%   9.78%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 1,046   $ 1,046    
Investment, Identifier [Axis]: Wash & Wax Systems LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [14],[20] 12.00%   12.00%    
PIK Rate [14],[15],[20] 12.00%   12.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20] $ 693   $ 693    
Investment, Identifier [Axis]: Watterson Brands, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 12.00% [14],[20]   12.00% [14],[20]   12.00% [12],[24]
PIK Rate 4.00% [14],[15],[20]   4.00% [14],[15],[20]   4.00% [12],[16],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     $ 292    
Ending balance [5],[14],[20] $ 266   $ 266    
Investment, Identifier [Axis]: Watterson Brands, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.00% [14],[20]   12.00% [14],[20]   12.00% [12],[24]
PIK Rate 4.00% [14],[15],[20]   4.00% [14],[15],[20]   4.00% [12],[16],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     $ 50    
Ending balance [5],[14],[20] $ 46   $ 46    
Investment, Identifier [Axis]: Watterson Brands, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 12.00% [14],[20]   12.00% [14],[20]   12.00% [12],[24]
PIK Rate 4.00% [14],[15],[20]   4.00% [14],[15],[20]   4.00% [12],[16],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     $ 2,076    
Ending balance [5],[14],[20] $ 1,891   $ 1,891    
Investment, Identifier [Axis]: Watterson Brands, LLC, Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 12.00% [14],[20]   12.00% [14],[20]   12.00% [12],[24]
PIK Rate 4.00% [14],[15],[20]   4.00% [14],[15],[20]   4.00% [12],[16],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24]     $ 1,874    
Ending balance [5],[14],[20] $ 1,706   1,706    
Investment, Identifier [Axis]: West Star Aviation Acquisition, LLC, Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[25]     640    
Investment, Identifier [Axis]: West Star Aviation Acquisition, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         9.47%
Spread [12],[24],[28],[29]         5.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     658    
Investment, Identifier [Axis]: West Star Aviation Acquisition, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         9.60%
Spread [12],[24],[28],[29]         5.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     2,917    
Investment, Identifier [Axis]: West Star Aviation Acquisition, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         9.60%
Spread [12],[24],[28],[29]         5.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 1,452    
Investment, Identifier [Axis]: Winter Services LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 11.77% [14],[20],[21],[27]   11.77% [14],[20],[21],[27]   12.81% [12],[24],[28]
Spread 7.50% [14],[20],[21],[22],[27]   7.50% [14],[20],[21],[22],[27]   8.00% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 2,672    
Ending balance [5],[14],[20],[21],[27] $ 1,611   $ 1,611    
Investment, Identifier [Axis]: Winter Services LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.05% [14],[20],[21]   12.05% [14],[20],[21]   12.85% [12],[24],[28]
Spread 7.50% [14],[20],[21],[22]   7.50% [14],[20],[21],[22]   8.00% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 2,276    
Ending balance [5],[14],[20],[21] $ 2,343   $ 2,343    
Investment, Identifier [Axis]: Winter Services LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 11.05% [14],[20],[21]   11.05% [14],[20],[21]   11.85% [12],[24],[28]
Spread 6.50% [14],[20],[21],[22]   6.50% [14],[20],[21],[22]   7.00% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 8,794    
Ending balance [5],[14],[20],[21] $ 9,050   $ 9,050    
Investment, Identifier [Axis]: Winter Services LLC, Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 13.05% [14],[20],[21]   13.05% [14],[20],[21]   13.85% [12],[24],[28]
Spread 8.50% [14],[20],[21],[22]   8.50% [14],[20],[21],[22]   9.00% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 8,794    
Ending balance [5],[14],[20],[21] $ 9,050   9,050    
Investment, Identifier [Axis]: World Micro Holdings, LLC, Preferred Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[25]     530    
Ending balance [5],[14],[20],[26] $ 530   $ 530    
Investment, Identifier [Axis]: World Micro Holdings, LLC, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 11.00% [14],[20]   11.00% [14],[20]   13.00% [12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12]     $ 1,468    
Ending balance [5],[14],[20] $ 1,352   $ 1,352    
Investment, Identifier [Axis]: Xenon Arc, Inc., Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 9.85% [14],[20],[21]   9.85% [14],[20],[21]   9.70% [12],[24],[28]
Spread 5.75% [14],[20],[21],[22]   5.75% [14],[20],[21],[22]   5.25% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 1,176    
Ending balance [5],[14],[20],[21] $ 1,167   $ 1,167    
Investment, Identifier [Axis]: Xenon Arc, Inc., Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.18% [14],[20],[21]   10.18% [14],[20],[21]   9.98% [12],[24],[28]
Spread 5.75% [14],[20],[21],[22]   5.75% [14],[20],[21],[22]   5.25% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 2,328    
Ending balance [5],[14],[20],[21] $ 2,310   $ 2,310    
Investment, Identifier [Axis]: Xenon Arc, Inc., Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [14],[20],[21] 9.85%   9.85%    
Spread [14],[20],[21],[22] 5.75%   5.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [5],[14],[20],[21] $ 605   $ 605    
Investment, Identifier [Axis]: YS Garments, LLC, Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 11.92% [13],[14],[21]   11.92% [13],[14],[21]   12.25% [11],[12],[28]
Spread 7.50% [13],[14],[21],[22]   7.50% [13],[14],[21],[22]   7.50% [11],[12],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[11],[12],[28]     $ 4,661    
Ending balance [5],[13],[14],[21] $ 4,171   $ 4,171    
Investment, Identifier [Axis]: ZRG Partners, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 12.50% [14],[20],[21]   12.50% [14],[20],[21]   12.50% [12],[24],[28]
Spread 5.00% [14],[20],[21],[22]   5.00% [14],[20],[21],[22]   5.00% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 86    
Ending balance [5],[14],[20],[21] $ 648   $ 648    
Investment, Identifier [Axis]: ZRG Partners, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.31% [14],[20],[21],[50]   10.31% [14],[20],[21],[50]   10.74% [12],[24],[28]
Spread 6.00% [14],[20],[21],[22],[50]   6.00% [14],[20],[21],[22],[50]   6.00% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 517    
Ending balance [5],[14],[20],[21],[50] $ 1,469   $ 1,469    
Investment, Identifier [Axis]: ZRG Partners, LLC, Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 10.17% [14],[20],[21]   10.17% [14],[20],[21]   10.28% [12],[24],[28]
Spread 6.00% [14],[20],[21],[22]   6.00% [14],[20],[21],[22]   6.00% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 817    
Ending balance [5],[14],[20],[21] $ 811   $ 811    
Investment, Identifier [Axis]: ZRG Partners, LLC, Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 10.14% [14],[20],[21]   10.14% [14],[20],[21]   10.66% [12],[24],[28]
Spread 6.00% [14],[20],[21],[22]   6.00% [14],[20],[21],[22]   6.00% [12],[24],[28],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 5,852    
Ending balance [5],[14],[20],[21] $ 5,802   5,802    
Investment, Identifier [Axis]: Zips Car Wash, LLC, Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         11.91%
Spread [12],[24],[28],[29]         7.25%
PIK Rate [12],[16],[24],[28]         11.91%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     2,025    
Investment, Identifier [Axis]: Zips Car Wash, LLC, Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [12],[24],[28]         11.91%
Spread [12],[24],[28],[29]         7.25%
PIK Rate [12],[16],[24],[28]         11.91%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[12],[24],[28]     $ 508    
[1] All portfolio company headquarters are based in the United States, unless otherwise noted.
[2] Investment Fair Value was determined using significant unobservable inputs, unless otherwise noted. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for further discussion. Negative fair value is the result of the capitalized discount on the loan or the unfunded commitment being valued below par.
[3] All investments are LMM portfolio investments, unless otherwise noted. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of LMM portfolio investments. All of the Fund’s investments, unless otherwise noted, are encumbered as security for one of the Fund’s Credit Facilities.
[4] All portfolio company headquarters are based in the United States, unless otherwise noted.
[5] Investment Fair Value was determined using significant unobservable inputs, unless otherwise noted. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for further discussion. Negative fair value is the result of the capitalized discount on the loan or the unfunded commitment being valued below par.
[6] All investments are LMM (as defined below) portfolio investments, unless otherwise noted. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of LMM portfolio investments. All of the Fund’s investments, unless otherwise noted, are encumbered as security for one of the Credit Facilities (as defined below).
[7] Control” investments are defined by the 1940 Act as investments in which more than 25% of the voting securities are owned or where the ability to nominate greater than 50% of the board representation is maintained.
[8] Control” investments are defined by the 1940 Act (as defined below) as investments in which more than 25% of the voting securities are owned or where the ability to nominate greater than 50% of the board representation is maintained.
[9] Affiliate” investments are defined by the 1940 Act as investments in which between 5% and 25% (inclusive) of the voting securities are owned and the investments are not classified as Control investments.
[10] Affiliate” investments are defined by the 1940 Act as investments in which between 5% and 25% (inclusive) of the voting securities are owned and the investments are not classified as Control investments.
[11] Middle Market portfolio investment. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of Middle Market portfolio investments.
[12] Non-Control/Non-Affiliate” investments are defined by the 1940 Act as investments that are neither Control investments nor Affiliate investments.
[13] Middle Market (as defined below) portfolio investment. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of Middle Market portfolio investments.
[14] Non-Control/Non-Affiliate” investments are defined by the 1940 Act as investments that are neither Control investments nor Affiliate investments.
[15] Investments may have a portion, or all, of their income received from Paid-in-Kind (“PIK”) interest or dividends. PIK interest income and cumulative dividend income represent income not paid currently in cash. The difference between the Total Rate and PIK Rate represents the cash rate as of September 30, 2025.
[16] Investments may have a portion, or all, of their income received from PIK interest or dividends. PIK interest income and cumulative dividend income represent income not paid currently in cash. The difference between the Total Rate and PIK Rate represents the cash rate as of December 31, 2024.
[17] Non-accrual and non-income producing debt investment.
[18] Warrants are presented in equivalent shares/units with a strike price of $0.01 per share/unit.
[19] Warrants are presented in equivalent shares/units with a strike price of $0.01 per share/unit.
[20] Private Loan (as defined below) portfolio investment. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of Private Loan portfolio investments.
[21] Index based floating interest rate is subject to contractual minimum interest rate. As noted in this schedule, 97% of the loans (based on the par amount) contain Secured Overnight Financing Rate (“SOFR”) floors which range between 0.75% and 5.25%, with a weighted-average floor of 1.29%.
[22] A majority of the variable rate loans in the Investment Portfolio (as defined below) bear interest at a rate that may be determined by reference to either SOFR (“SF”) or an alternate base rate (commonly based on the federal funds rate or the prime rate (“P”)), which typically resets every one, three, or six months at the borrower’s option. SOFR based contracts may include a credit spread adjustment (the “Adjustment”) that is charged in addition to the stated spread. The Adjustment is applied when the SOFR, plus the Adjustment, exceeds the stated floor rate, as applicable. As of September 30, 2025, SOFR based contracts in the portfolio had Adjustments ranging from 0.10% to 0.26%.
[23] The position is unfunded and no interest income is being earned as of September 30, 2025. The position may earn a nominal unused facility fee on committed amounts.
[24] Private Loan portfolio investment. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of Private Loan portfolio investments.
[25] Income producing through dividends or distributions.
[26] Income producing through dividends or distributions.
[27] Revolving line of credit facility permits the borrower to make an interest rate election regarding the base rate on each draw under the facility. The rate presented represents a weighted-average rate for borrowings under the facility, as of September 30, 2025.
[28] Index based floating interest rate is subject to contractual minimum interest rate. As noted in this schedule, 96% of the loans (based on the par amount) contain SOFR floors which range between 0.75% and 5.25%, with a weighted-average floor of 1.28%.
[29] A majority of the variable rate loans in the Investment Portfolio bear interest at a rate that may be determined by reference to either SOFR (“SF”) or an alternate base rate (commonly based on the federal funds rate or the prime rate (“P”)), which typically resets every one, three, or six months at the borrower’s option. SOFR based contracts may include a credit spread adjustment (the “Adjustment”) that is charged in addition to the stated spread. The Adjustment is applied when the SOFR, plus the Adjustment, exceeds the stated floor rate, as applicable. As of December 31, 2024, SOFR based contracts in the portfolio had Adjustments ranging from 0.10% to 0.26%.
[30] The position is unfunded and no interest income is being earned as of December 31, 2024. The position may earn a nominal unused facility fee on committed amounts.
[31] Index based floating interest rate is subject to contractual maximum base rate of 3.00%.
[32] Index based floating interest rate is subject to contractual maximum base rate of 3.00%.
[33] Non-accrual and non-income producing debt investment.
[34] Maturity date is under on-going negotiations with the portfolio company and other lenders, if applicable.
[35] Revolving line of credit facility permits the borrower to make an interest rate election regarding the base rate on each draw under the facility. The rate presented represents a weighted-average rate for borrowings under the facility, as of December 31, 2024.
[36] Shares/Units represent ownership in a related real estate or holding entity.
[37] Shares/Units represent ownership in a related real estate or holding entity.
[38] Investment purchased through a distressed sale with the intention to be sold on a short-term basis.
[39] Investment is not a qualifying asset as defined under Section 55(a) of the 1940 Act. Qualifying assets must represent at least 70% of total assets at the time of acquisition of any additional non-qualifying assets.
[40] Portfolio company headquarters are located outside of the United States.
[41] Investment is not a qualifying asset as defined under Section 55(a) of the 1940 Act. Qualifying assets must represent at least 70% of total assets at the time of acquisition of any additional non-qualifying assets.
[42] Portfolio company headquarters are located outside of the United States.
[43] Investment is not unitized. Presentation is made in percent of fully diluted ownership unless otherwise indicated.
[44] Other Portfolio investment. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of Other Portfolio investments.
[45] Investment is not unitized. Presentation is made in percent of fully diluted ownership unless otherwise indicated.
[46] Other Portfolio investment. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of Other Portfolio investments.
[47] Maturity date is under on-going negotiations with the portfolio company and other lenders, if applicable.
[48] Index based floating interest rate is subject to contractual maximum base rate of 4.00%.
[49] Index based floating interest rate is subject to contractual maximum base rate of 4.00%
[50] Each new draw or funding on the facility has a different floating rate reset date. The rate presented represents a weighted-average rate for borrowings under the facility, as of September 30, 2025.
[51] Investment is accruing income at the fixed cash rate of 2.50% as of September 30, 2025.
[52] Each new draw or funding on the facility has a different floating rate reset date. The rate presented represents a weighted-average rate for borrowings under the facility, as of December 31, 2024.
[53] The Fund has entered into an intercreditor agreement that entitles the Fund to the “last out” tranche of the first lien secured loans, whereby the “first out” tranche will receive priority as to the “last out” tranche with respect to payments of principal, interest, and any other amounts due thereunder. Therefore, the Fund receives a higher interest rate than the contractual stated interest rate of 11.85% per the credit agreement and the Consolidated Schedule of Investments above reflects such higher rate.
[54] The Fund has entered into an intercreditor agreement that entitles the Fund to the “last out” tranche of the first lien secured loans, whereby the “first out” tranche will receive priority as to the “last out” tranche with respect to payments of principal, interest, and any other amounts due thereunder. Therefore, the Fund receives a higher interest rate than the contractual stated interest rate of 11.75% per the credit agreement and the Consolidated Schedule of Investments above reflects such higher rate.