Annual report [Section 13 and 15(d), not S-K Item 405]

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

v3.25.4
Consolidated Schedule of Investments In and Advances to Affiliates (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) $ (9,503) $ 15,776 $ (34,010)
Amount of Unrealized Gain/(Loss) 36,428 (15,439) 46,319
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [1],[2],[3] 1,177,507    
Ending balance 1,335,387 [4],[5],[6] 1,177,507 [1],[2],[3]  
Control investments      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 5,305 147 2,223
Amount of Unrealized Gain/(Loss) (9,495) 4,833 (1,289)
Amount of Interest, Fees or Dividends Credited to Income 5,483 3,441  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 69,878 [2],[7] 53,644  
Gross Additions 5,352 18,885  
Gross Reductions 16,858 2,651  
Ending balance 58,372 [5],[8] 69,878 [2],[7] 53,644
Affiliate investments      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 6,320 (3,560) (7,188)
Amount of Unrealized Gain/(Loss) 17,548 7,791 25,116
Amount of Interest, Fees or Dividends Credited to Income 38,849 31,222  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 351,360 [2],[9] 291,279  
Gross Additions 109,426 118,673  
Gross Reductions 61,929 95,570  
Ending balance $ 406,771 [5],[10] $ 351,360 [2],[9] 291,279
Investment, Identifier [Axis]: Fidelity Government Portfolio Fund Class III      
Schedule of Investments [Line Items]      
Total Rate 3.42% 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 0 [5],[13],[14] $ 0 [2],[11],[12]  
Investment, Identifier [Axis]: AAC Holdings, Inc. | Preferred Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[13],[14] $ 720    
Investment, Identifier [Axis]: AAC Holdings, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 20.00% [13],[14] 18.00% [11],[12]  
PIK Rate 20.00% [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 $ 308 [5],[13],[14] $ 209 [2],[11],[12]  
Investment, Identifier [Axis]: AAC Holdings, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 21.00% [13],[14] 18.00% [11],[12]  
PIK Rate 21.00% [13],[14],[15] 18.00% [11],[12],[16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[12] $ 5,975    
Ending balance $ 173 [5],[13],[14] $ 5,975 [2],[11],[12]  
Investment, Identifier [Axis]: AAC Holdings, Inc. | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [13],[14],[17] 20.00%    
PIK Rate [13],[14],[15],[17] 20.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[13],[14],[17] $ 948    
Investment, Identifier [Axis]: AAC Holdings, Inc. | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate [13],[14],[17] 20.00%    
PIK Rate [13],[14],[15],[17] 20.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[13],[14],[17] $ 948    
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 [2],[11],[12],[18]   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],[19] $ 1,000    
Investment, Identifier [Axis]: AGS American Glass Services Acquisition, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread [14],[19],[20],[21],[22] 5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[21],[22] $ (47)    
Investment, Identifier [Axis]: AGS American Glass Services Acquisition, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Spread [14],[19],[20],[21],[22] 5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[21],[22] $ (27)    
Investment, Identifier [Axis]: AGS American Glass Services Acquisition, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 9.22%    
Spread [14],[19],[20],[22] 5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 13,440    
Investment, Identifier [Axis]: AMEREQUIP LLC | Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[24] 30    
Ending balance 0 [5],[14],[19],[25] 30 [2],[12],[23],[24]  
Investment, Identifier [Axis]: ATS Operating, LLC | Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] 120    
Ending balance $ 140 [5],[14],[19] $ 120 [2],[12],[23]  
Investment, Identifier [Axis]: ATS Operating, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.22% [14],[19],[22],[26] 10.85% [12],[23],[27]  
Spread 6.00% [14],[19],[20],[22],[26] 6.00% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 50    
Ending balance $ 250 [5],[14],[19],[22],[26] $ 50 [2],[12],[23],[27]  
Investment, Identifier [Axis]: ATS Operating, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.25% [14],[19],[22] 9.85% [12],[23],[27]  
Spread 5.00% [14],[19],[20],[22] 5.00% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 925    
Ending balance $ 925 [5],[14],[19],[22] $ 925 [2],[12],[23],[27]  
Investment, Identifier [Axis]: ATS Operating, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 11.25% [14],[19],[22] 11.85% [12],[23],[27]  
Spread 7.00% [14],[19],[20],[22] 7.00% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 925    
Ending balance 925 [5],[14],[19],[22] $ 925 [2],[12],[23],[27]  
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[24] 124    
Ending balance $ 128 [5],[14],[19],[25] $ 124 [2],[12],[23],[24]  
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 7.25% [14],[19],[20],[21],[22] 7.25% [12],[23],[27],[28],[29]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] $ (12)    
Ending balance $ (9) [5],[14],[19],[21],[22] $ (12) [2],[12],[23],[27],[29]  
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.09% [14],[19],[22] 11.73% [12],[23],[27]  
Spread 7.25% [14],[19],[20],[22] 7.25% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 3,343    
Ending balance $ 3,257 [5],[14],[19],[22] $ 3,343 [2],[12],[23],[27]  
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Spread [14],[19],[20],[21],[22] 7.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[21],[22] $ (5)    
Investment, Identifier [Axis]: Adams Publishing Group, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.00% [14],[19],[22],[30] 11.00% [12],[23],[27],[31]  
Spread 7.00% [14],[19],[20],[22],[30] 7.00% [12],[23],[27],[28],[31]  
PIK Rate 1.00% [14],[15],[19],[22],[30] 1.00% [12],[16],[23],[27],[31]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[31] $ 928    
Ending balance $ 951 [5],[14],[19],[22],[30] $ 928 [2],[12],[23],[27],[31]  
Investment, Identifier [Axis]: Adams Publishing Group, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.00% [14],[19],[22] 11.00% [12],[23],[27],[31]  
Spread 7.00% [14],[19],[20],[22] 7.00% [12],[23],[27],[28],[31]  
PIK Rate 1.00% [14],[15],[19],[22] 1.00% [12],[16],[23],[27],[31]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[31] $ 2,209    
Ending balance $ 93 [5],[14],[19],[22] $ 2,209 [2],[12],[23],[27],[31]  
Investment, Identifier [Axis]: Adams Publishing Group, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22],[30] 11.00%    
Spread [14],[19],[20],[22],[30] 7.00%    
PIK Rate [14],[15],[19],[22],[30] 1.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22],[30] $ 1,959    
Investment, Identifier [Axis]: Airo Purchaser, Inc. | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19] $ 1,233    
Investment, Identifier [Axis]: Airo Purchaser, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread [14],[19],[20],[21],[22] 5.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[21],[22] $ (51)    
Investment, Identifier [Axis]: Airo Purchaser, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Spread [14],[19],[20],[21],[22] 5.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[21],[22] $ (26)    
Investment, Identifier [Axis]: Airo Purchaser, Inc. | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 9.22%    
Spread [14],[19],[20],[22] 5.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 22,110    
Investment, Identifier [Axis]: American Health Staffing Group, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 5.00% [14],[19],[20],[21],[22] 5.00% [12],[23],[27],[28],[29]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] $ (6)    
Ending balance $ (3) [5],[14],[19],[21],[22] $ (6) [2],[12],[23],[27],[29]  
Investment, Identifier [Axis]: American Health Staffing Group, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.75% [14],[19],[22] 12.50% [12],[23],[27]  
Spread 5.00% [14],[19],[20],[22] 5.00% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 7,703    
Ending balance 7,000 [5],[14],[19],[22] $ 7,703 [2],[12],[23],[27]  
Investment, Identifier [Axis]: American Nuts, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) (1,346)    
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 1,346    
Ending balance $ 1,210 [5],[10],[19] $ 0  
Investment, Identifier [Axis]: American Nuts, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 12.64% [10],[19],[22] 14.49% [12],[23],[27]  
Spread 8.50% [10],[19],[20],[22] 9.75% [12],[23],[27],[28]  
PIK Rate 12.64% [10],[15],[19],[22] 14.49% [12],[16],[23],[27]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 4,480    
Ending balance $ 2,325 [5],[10],[19],[22] $ 4,480 [2],[12],[23],[27]  
Investment, Identifier [Axis]: American Nuts, LLC | Secured Debt 1.1      
Schedule of Investments [Line Items]      
Total Rate 12.64%    
Spread 8.50%    
PIK Rate 12.64%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 217    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 2,325    
Gross Reductions 0    
Ending balance $ 2,325 $ 0  
Investment, Identifier [Axis]: American Nuts, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.64% [10],[19],[22] 16.49% [12],[23],[27],[32]  
Spread 8.50% [10],[19],[20],[22] 11.75% [12],[23],[27],[28],[32]  
PIK Rate 12.64% [10],[15],[19],[22] 16.49% [12],[16],[23],[27],[32]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[32] $ 2,621    
Ending balance $ 1,875 [5],[10],[19],[22] $ 2,621 [2],[12],[23],[27],[32]  
Investment, Identifier [Axis]: American Nuts, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 12.64%    
Spread 8.50%    
PIK Rate 12.64%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (450)    
Amount of Interest, Fees or Dividends Credited to Income 217    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 2,325    
Gross Reductions 450    
Ending balance 1,875 0  
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],[32],[33] 59    
Ending balance [2],[11],[12],[32],[33]   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],[32],[33] 282    
Ending balance [2],[11],[12],[32],[33]   282  
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    
Ending balance 1,510 [5],[10] 1,330 [2],[9]  
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) 30 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 30 0  
Gross Reductions 0 0  
Ending balance 30 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    
Ending balance 30 [5],[10] 0 [2],[9]  
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) 190 120  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,330 1,210  
Gross Additions 190 120  
Gross Reductions 10 0  
Ending balance $ 1,510 1,330 1,210
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate [10] 13.75%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 162    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,012    
Gross Additions 3    
Gross Reductions 50    
Ending balance 965 [5],[10] 1,012  
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, 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   4  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[9],[29] 54  
Gross Additions   0  
Gross Reductions   54  
Ending balance   $ 0 [2],[9],[29] 54
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [9]   13.75%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   175  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,012 [2],[9] 1,020  
Gross Additions   79  
Gross Reductions   87  
Ending balance   1,012 [2],[9] 1,020
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],[34] $ 0 [2],[9],[18] 0
Investment, Identifier [Axis]: Ansira Partners II, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread [12],[23],[27],[28],[29]   6.75%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] (45)    
Ending balance [2],[12],[23],[27],[29]   $ (45)  
Investment, Identifier [Axis]: Ansira Partners II, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   11.25%  
Spread [12],[23],[27],[28]   6.75%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] 17,375    
Ending balance [2],[12],[23],[27]   $ 17,375  
Investment, Identifier [Axis]: ArborWorks, LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] 0    
Ending balance 0 [5],[14],[19] 0 [2],[12],[23]  
Investment, Identifier [Axis]: ArborWorks, LLC | Preferred Equity 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] 6,667    
Ending balance 8,848 [5],[14],[19] 6,667 [2],[12],[23]  
Investment, Identifier [Axis]: ArborWorks, LLC | Preferred Equity 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] 0    
Ending balance $ 0 [5],[14],[19] $ 0 [2],[12],[23]  
Investment, Identifier [Axis]: ArborWorks, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 15.00% [14],[19] 15.00% [12],[23]  
PIK Rate 15.00% [14],[15],[19] 15.00% [12],[16],[23]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] $ 1,061    
Ending balance $ 2,218 [5],[14],[19] $ 1,061 [2],[12],[23]  
Investment, Identifier [Axis]: ArborWorks, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.34% [14],[19],[22] 11.08% [12],[23],[27]  
Spread 6.50% [14],[19],[20],[22] 6.50% [12],[23],[27],[28]  
PIK Rate 10.34% [14],[15],[19],[22] 11.08% [12],[16],[23],[27]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 4,278    
Ending balance 4,772 [5],[14],[19],[22] $ 4,278 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Archer Systems, LLC | Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] 110    
Ending balance $ 110 [5],[14],[19],[25] 110 [2],[12],[23]  
Investment, Identifier [Axis]: Auria Space, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread [14],[19],[20],[21],[22] 5.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[21],[22] $ (38)    
Investment, Identifier [Axis]: Auria Space, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Spread [14],[19],[20],[21],[22] 5.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[21],[22] $ (68)    
Investment, Identifier [Axis]: Auria Space, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 8.72%    
Spread [14],[19],[20],[22] 5.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 12,740    
Investment, Identifier [Axis]: B-O-F Corporation | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19] $ 180    
Investment, Identifier [Axis]: B-O-F Corporation | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread [14],[19],[20],[21],[22] 5.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[21],[22] $ (12)    
Investment, Identifier [Axis]: B-O-F Corporation | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 8.74%    
Spread [14],[19],[20],[22] 4.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 2,831    
Investment, Identifier [Axis]: B-O-F Corporation | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 10.74%    
Spread [14],[19],[20],[22] 6.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 2,831    
Investment, Identifier [Axis]: BDB Holdings, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) (4,180) (415)  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 12,610 [2],[7] 0  
Gross Additions 0 13,025  
Gross Reductions 4,180 415  
Ending balance $ 8,430 [5],[8] 12,610 [2],[7] 0
Investment, Identifier [Axis]: BDB Holdings, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate [8] 12.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 58    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 1,182    
Gross Reductions 0    
Ending balance 1,182 [5],[8] 0  
Investment, Identifier [Axis]: BP Loenbro Holdings Inc. | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] 1,550    
Ending balance $ 3,790 [5],[14],[19] $ 1,550 [2],[12],[23]  
Investment, Identifier [Axis]: BP Loenbro Holdings Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.75% [14],[19],[22],[26] 10.68% [12],[23],[27],[35]  
Spread 5.75% [14],[19],[20],[22],[26] 6.25% [12],[23],[27],[28],[35]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[35] $ 514    
Ending balance $ 1,024 [5],[14],[19],[22],[26] $ 514 [2],[12],[23],[27],[35]  
Investment, Identifier [Axis]: BP Loenbro Holdings Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 9.84%    
Spread 5.75% [14],[19],[20],[22] 6.25% [12],[23],[27],[28],[29]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] $ (10)    
Ending balance $ 1,279 [5],[14],[19],[22] $ (10) [2],[12],[23],[27],[29]  
Investment, Identifier [Axis]: BP Loenbro Holdings Inc. | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 9.75% [14],[19],[22] 10.92% [12],[23],[27]  
Spread 5.75% [14],[19],[20],[22] 6.25% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 11,217    
Ending balance $ 11,003 [5],[14],[19],[22] $ 11,217 [2],[12],[23],[27]  
Investment, Identifier [Axis]: BP Loenbro Holdings Inc. | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 9.83%    
Spread [14],[19],[20],[22] 5.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 0    
Investment, Identifier [Axis]: BP Loenbro Holdings Inc. | Secured Debt 5      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 9.84%    
Spread [14],[19],[20],[22] 5.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 4,219    
Investment, Identifier [Axis]: Barfly Ventures, LLC | Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 2,688 0  
Amount of Unrealized Gain/(Loss) (1,425) 573  
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],[23] 1,380  
Gross Additions 2,688 573  
Gross Reductions 4,641 0  
Ending balance 0 1,953 [2],[9],[23] 1,380
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 145 85  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 570 [2],[9],[24] 680  
Gross Additions 400 0  
Gross Reductions 0 110  
Ending balance 970 [5],[10],[25] $ 570 [2],[9],[24] 680
Investment, Identifier [Axis]: Batjer TopCo, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [9]   10.00%  
Amount of Realized Gain/(Loss) 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 (1)  
Amount of Interest, Fees or Dividends Credited to Income 1 5  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 50 [2],[9] 0  
Gross Additions 0 51  
Gross Reductions 50 1  
Ending balance 0 [5],[10],[21] $ 50 [2],[9] 0
Investment, Identifier [Axis]: Batjer TopCo, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [9]   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 2 3  
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 [5],[10],[21] $ 30 [2],[9] 30
Investment, Identifier [Axis]: Batjer TopCo, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 10.00% [10] 10.00% [9]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 5 (15)  
Amount of Interest, Fees or Dividends Credited to Income 125 124  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,165 [2],[9] 1,175  
Gross Additions 10 5  
Gross Reductions 70 15  
Ending balance 1,105 [5],[10] 1,165 [2],[9] 1,175
Investment, Identifier [Axis]: Behavior Development Group Holdings | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19] $ 500    
Investment, Identifier [Axis]: Behavior Development Group Holdings | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread [14],[19],[20],[21],[22] 6.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[21],[22] $ (37)    
Investment, Identifier [Axis]: Behavior Development Group Holdings | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 9.70%    
Spread [14],[19],[20],[22] 6.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 15,757    
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],[23] 0    
Ending balance 0 [5],[14],[19],[36] 0 [2],[12],[23]  
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],[23],[37] 0    
Ending balance 0 [5],[14],[19],[36] 0 [2],[12],[23],[37]  
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],[23],[37] 0    
Ending balance 0 [5],[14],[19],[36] 0 [2],[12],[23],[37]  
Investment, Identifier [Axis]: Bettercloud, Inc. | Common Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) (354)    
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 4,904    
Gross Reductions 354    
Ending balance $ 4,550 [5],[10],[19] 0  
Investment, Identifier [Axis]: Bettercloud, Inc. | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate [10],[19],[22] 12.07%    
Spread [10],[19],[20],[22] 8.25%    
PIK Rate [10],[15],[19],[22] 12.07%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 27    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 1,747    
Gross Reductions 0    
Ending balance 1,747 [5],[10],[19],[22] $ 0  
Investment, Identifier [Axis]: Bettercloud, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread [12],[23],[27],[28],[29]   10.25%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] (14)    
Ending balance [2],[12],[23],[27],[29]   $ (14)  
Investment, Identifier [Axis]: Bettercloud, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   15.76%  
Spread [12],[23],[27],[28]   10.25%  
PIK Rate [12],[16],[23],[27]   9.25%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] 6,963    
Ending balance [2],[12],[23],[27]   $ 6,963  
Investment, Identifier [Axis]: Binswanger Enterprises, LLC | Member Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] 650    
Ending balance [2],[12],[23]   650  
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 $ 0 [5],[13],[14] $ 0 [2],[11],[12]  
Investment, Identifier [Axis]: Bluestem Brands, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 12.49% [13],[14],[17],[22] 13.17% [11],[12],[27]  
Spread 8.50% [13],[14],[17],[20],[22] 8.50% [11],[12],[27],[28]  
PIK Rate 11.49% [13],[14],[15],[17],[22] 12.17% [11],[12],[16],[27]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[12],[27] $ 181    
Ending balance $ 255 [5],[13],[14],[17],[22] $ 181 [2],[11],[12],[27]  
Investment, Identifier [Axis]: Bluestem Brands, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 14.25% [13],[14],[17],[22] 15.00% [11],[12],[27]  
Spread 7.50% [13],[14],[17],[20],[22] 7.50% [11],[12],[27],[28]  
PIK Rate 13.25% [13],[14],[15],[17],[22] 14.75% [11],[12],[16],[27]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[12],[27] $ 2,792    
Ending balance $ 195 [5],[13],[14],[17],[22] $ 2,792 [2],[11],[12],[27]  
Investment, Identifier [Axis]: Bluestem Brands, Inc. | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 12.49% [13],[14],[17],[22] 13.17% [11],[12],[27]  
Spread 8.50% [13],[14],[17],[20],[22] 8.50% [11],[12],[27],[28]  
PIK Rate 11.49% [13],[14],[15],[17],[22] 12.17% [11],[12],[16],[27]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[12],[27] $ 3,790    
Ending balance 0 [5],[13],[14],[17],[22] $ 3,790 [2],[11],[12],[27]  
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 0 [5],[13],[14],[34] 0 [2],[11],[12],[18]  
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 $ 700 [5],[14],[25] $ 80 [2],[12]  
Investment, Identifier [Axis]: Boccella Precast Products LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 10.00% [14] 10.00% [12]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12] $ 66    
Ending balance 64 [5],[14] $ 66 [2],[12]  
Investment, Identifier [Axis]: Bond Brand Loyalty ULC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[38],[39] 0    
Ending balance 0 [5],[14],[19],[40],[41] 0 [2],[12],[23],[38],[39]  
Investment, Identifier [Axis]: Bond Brand Loyalty ULC | Preferred Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[38],[39] 310    
Ending balance $ 350 [5],[14],[19],[40],[41] $ 310 [2],[12],[23],[38],[39]  
Investment, Identifier [Axis]: Bond Brand Loyalty ULC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.89% [14],[19],[22],[40],[41] 11.65% [12],[23],[27],[38],[39]  
Spread 5.75% [14],[19],[20],[22],[40],[41] 7.00% [12],[23],[27],[28],[38],[39]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[38],[39] $ 360    
Ending balance $ 360 [5],[14],[19],[22],[40],[41] $ 360 [2],[12],[23],[27],[38],[39]  
Investment, Identifier [Axis]: Bond Brand Loyalty ULC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.59% [14],[19],[22],[40],[41] 10.74% [12],[23],[27],[38],[39]  
Spread 5.75% [14],[19],[20],[22],[40],[41] 6.00% [12],[23],[27],[28],[38],[39]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[38],[39] $ 3,999    
Ending balance $ 880 [5],[14],[19],[22],[40],[41] $ 3,999 [2],[12],[23],[27],[38],[39]  
Investment, Identifier [Axis]: Bond Brand Loyalty ULC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 8.89% [14],[19],[22],[40],[41] 12.74% [12],[23],[27],[38],[39]  
Spread 4.75% [14],[19],[20],[22],[40],[41] 8.00% [12],[23],[27],[28],[38],[39]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[38],[39] $ 3,999    
Ending balance $ 3,959 [5],[14],[19],[22],[40],[41] $ 3,999 [2],[12],[23],[27],[38],[39]  
Investment, Identifier [Axis]: Bond Brand Loyalty ULC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22],[40],[41] 10.89%    
Spread [14],[19],[20],[22],[40],[41] 6.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22],[40],[41] $ 3,959    
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)   (230)  
Amount of Interest, Fees or Dividends Credited to Income   30  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,170 [2],[9],[24] 1,400  
Gross Additions   0  
Gross Reductions   230  
Ending balance   1,170 [2],[9],[24] 1,400
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC | Preferred Member Units 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) (310)    
Amount of Interest, Fees or Dividends Credited to Income 30    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,170    
Gross Additions 0    
Gross Reductions 310    
Ending balance $ 860 [5],[10],[25] 1,170  
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC | Preferred Member Units 2      
Schedule of Investments [Line Items]      
Total Rate [10],[25] 15.00%    
PIK Rate [10],[15],[25] 15.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 6    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 84    
Gross Reductions 0    
Ending balance $ 84 [5],[10],[25] $ 0  
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 13.98% [10],[22] 14.66% [9],[27]  
Spread 10.00% [10],[20],[22] 10.00% [9],[27],[28]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 182 205  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,254 [2],[9],[27] 1,374  
Gross Additions 0 4  
Gross Reductions 0 124  
Ending balance 1,254 [5],[10],[22] 1,254 [2],[9],[27] 1,374
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],[38],[42],[43] 1,039    
Ending balance 897 [5],[14],[40],[44],[45] 1,039 [2],[12],[38],[42],[43]  
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],[24],[38],[42],[43] 8,031    
Ending balance $ 6,447 [5],[14],[25],[40],[44],[45] $ 8,031 [2],[12],[24],[38],[42],[43]  
Investment, Identifier [Axis]: Buca C, LLC | Preferred Member Units      
Schedule of Investments [Line Items]      
Total Rate 6.00% [14] 6.00% [12]  
PIK Rate 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 $ 0 [5],[14] $ 0 [2],[12]  
Investment, Identifier [Axis]: Buca C, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 15.00% [14],[17],[46] 15.00% [12],[32],[33]  
PIK Rate 15.00% [14],[15],[17],[46] 15.00% [12],[16],[32],[33]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[32],[33] $ 0    
Ending balance $ 0 [5],[14],[17],[46] $ 0 [2],[12],[32],[33]  
Investment, Identifier [Axis]: Buca C, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 15.00% [14],[17],[46] 15.00% [12],[32]  
PIK Rate 15.00% [14],[15],[17],[46] 15.00% [12],[16],[32]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[32] $ 0    
Ending balance $ 0 [5],[14],[17],[46] $ 0 [2],[12],[32]  
Investment, Identifier [Axis]: Buca C, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 15.00% [14],[17],[46] 15.00% [12],[32],[33]  
PIK Rate 15.00% [14],[15],[17],[46] 15.00% [12],[16],[32],[33]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[32],[33] $ 0    
Ending balance 0 [5],[14],[17],[46] $ 0 [2],[12],[32],[33]  
Investment, Identifier [Axis]: Burning Glass Intermediate Holding Company, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread [12],[23],[27],[28],[29]   5.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] 0    
Ending balance [2],[12],[23],[27],[29]   $ 0  
Investment, Identifier [Axis]: Burning Glass Intermediate Holding Company, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   9.46%  
Spread [12],[23],[27],[28]   5.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] 11,575    
Ending balance [2],[12],[23],[27]   $ 11,575  
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    
Ending 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    
Ending balance [2],[12]   $ 0  
Investment, Identifier [Axis]: CQ Fluency, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 6.75% [14],[19],[20],[21],[22] 6.75% [12],[23],[27],[28],[29]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] $ (31)    
Ending balance $ (19) [5],[14],[19],[21],[22] $ (31) [2],[12],[23],[27],[29]  
Investment, Identifier [Axis]: CQ Fluency, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 10.52%    
Spread 6.75% [14],[19],[20],[22] 6.75% [12],[23],[27],[28],[29]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] $ (31)    
Ending balance 6,844 [5],[14],[19],[22] $ (31) [2],[12],[23],[27],[29]  
Investment, Identifier [Axis]: CQ Fluency, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   11.18%  
Spread [12],[23],[27],[28]   6.75%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 7,169    
Ending balance [2],[12],[23],[27]   $ 7,169  
Investment, Identifier [Axis]: CRC Evans USA Bidco, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22],[26],[40],[41] 10.87%    
Spread [14],[19],[20],[22],[26],[40],[41] 6.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22],[26],[40],[41] $ 448    
Investment, Identifier [Axis]: CRC Evans USA Bidco, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Spread [14],[19],[20],[21],[40],[41] 6.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[21],[40],[41] $ (18)    
Investment, Identifier [Axis]: CRC Evans USA Bidco, Inc. | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22],[40],[41] 10.70%    
Spread [14],[19],[20],[22],[40],[41] 6.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22],[40],[41] $ 613    
Investment, Identifier [Axis]: CRC Evans USA Bidco, Inc. | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22],[40],[41] 10.83%    
Spread [14],[19],[20],[22],[40],[41] 6.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22],[40],[41] $ 979    
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 $ 600 [5],[14] $ 530 [2],[12]  
Investment, Identifier [Axis]: Career Team Holdings, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [12],[27]   10.56%  
Spread 6.00% [14],[20],[21],[22] 6.00% [12],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[27] $ 97    
Ending balance $ (6) [5],[14],[21],[22] $ 97 [2],[12],[27]  
Investment, Identifier [Axis]: Career Team Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 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 2,379 [5],[14] $ 2,134 [2],[12]  
Investment, Identifier [Axis]: CaseWorthy, Inc. | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] 160    
Ending balance 230 [5],[14],[19] 160 [2],[12],[23]  
Investment, Identifier [Axis]: CenterPeak Holdings, LLC | Preferred Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[24] 1,610    
Ending balance $ 2,700 [5],[14],[25] 1,610 [2],[12],[24]  
Investment, Identifier [Axis]: CenterPeak Holdings, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [14] 15.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[29] $ 0    
Ending balance $ 200 [5],[14] $ 0 [2],[12],[29]  
Investment, Identifier [Axis]: CenterPeak Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 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 2,790 [5],[14] $ 2,390 [2],[12]  
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC | Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 7,570 284  
Amount of Interest, Fees or Dividends Credited to Income 30 30  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 3,110 [2],[9] 2,760  
Gross Additions 7,570 350  
Gross Reductions 0 0  
Ending balance $ 10,680 [5],[10] $ 3,110 [2],[9] 2,760
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 8.00% [10],[20],[21],[22] 9.00% [9],[27],[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 3 3  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[9],[27],[29] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 0 [5],[10],[21],[22] $ 0 [2],[9],[27],[29] 0
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.98% [10],[22] 13.66% [9],[27]  
Spread 8.00% [10],[20],[22] 9.00% [9],[27],[28]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (10) 28  
Amount of Interest, Fees or Dividends Credited to Income 848 79  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 6,384 [2],[9],[27] 0  
Gross Additions 10 6,564  
Gross Reductions 373 180  
Ending balance 6,021 [5],[10],[22] $ 6,384 [2],[9],[27] 0
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Spread   10.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   725  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 0  
Gross Additions   919  
Gross Reductions   919  
Ending balance   0 0
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   (29)  
Amount of Interest, Fees or Dividends Credited to Income   84  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 4,394  
Gross Additions   0  
Gross Reductions   4,394  
Ending balance   0 4,394
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) 600 950  
Amount of Interest, Fees or Dividends Credited to Income 1,739 1,179  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 8,280 [2],[9],[24] 7,330  
Gross Additions 600 950  
Gross Reductions 0 0  
Ending balance 8,880 [5],[10],[25] 8,280 [2],[9],[24] 7,330
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) 155 173  
Amount of Interest, Fees or Dividends Credited to Income 23 23  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 888 [2],[9],[24],[37] 715  
Gross Additions 155 174  
Gross Reductions 0 1  
Ending balance $ 1,043 [5],[10],[25],[36] $ 888 [2],[9],[24],[37] 715
Investment, Identifier [Axis]: Chamberlin Holding LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 6.00% [10],[20],[21],[22] 6.00% [9],[27],[28],[29]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (5) (22)  
Amount of Interest, Fees or Dividends Credited to Income 22 25  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[9],[27],[29] 0  
Gross Additions 5 22  
Gross Reductions 5 22  
Ending balance $ 0 [5],[10],[21],[22] $ 0 [2],[9],[27],[29] 0
Investment, Identifier [Axis]: Chamberlin Holding LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.99% [10],[22] 12.74% [9],[27]  
Spread 8.00% [10],[20],[22] 8.00% [9],[27],[28]  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (1)  
Amount of Interest, Fees or Dividends Credited to Income   530  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 3,905 [2],[9],[27] 3,905  
Gross Additions   1  
Gross Reductions   1  
Ending balance $ 10,505 [5],[10],[22] 3,905 [2],[9],[27] 3,905
Investment, Identifier [Axis]: Chamberlin Holding LLC | Secured Debt 2.1      
Schedule of Investments [Line Items]      
Spread 8.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (1)    
Amount of Interest, Fees or Dividends Credited to Income 480    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 3,905    
Gross Additions 0    
Gross Reductions 3,905    
Ending balance $ 0 3,905  
Investment, Identifier [Axis]: Chamberlin Holding LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 11.99%    
Spread 8.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 150    
Amount of Interest, Fees or Dividends Credited to Income 189    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 10,505    
Gross Reductions 0    
Ending balance $ 10,505 $ 0  
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.84% [14],[19],[22],[26] 11.53% [12],[23],[27],[35]  
Spread 6.75% [14],[19],[20],[22],[26] 7.00% [12],[23],[27],[28],[35]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[35] $ 444    
Ending balance $ 667 [5],[14],[19],[22],[26] $ 444 [2],[12],[23],[27],[35]  
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.84% [14],[19],[22] 11.93% [12],[23],[27]  
Spread 6.75% [14],[19],[20],[22] 7.00% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 3,166    
Ending balance $ 3,291 [5],[14],[19],[22] $ 3,166 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 10.84% [14],[19],[22] 11.93% [12],[23],[27]  
Spread 6.75% [14],[19],[20],[22] 7.00% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 175    
Ending balance $ 182 [5],[14],[19],[22] $ 175 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 10.84% [14],[19],[22] 11.93% [12],[23],[27]  
Spread 6.75% [14],[19],[20],[22] 7.00% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 424    
Ending balance 441 [5],[14],[19],[22] $ 424 [2],[12],[23],[27]  
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) 110 (20)  
Amount of Interest, Fees or Dividends Credited to Income 270 200  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 3,900 [2],[9],[24] 3,920  
Gross Additions 110 0  
Gross Reductions 0 20  
Ending balance 4,010 [5],[10],[25] 3,900 [2],[9],[24] 3,920
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 1,450  
Amount of Interest, Fees or Dividends Credited to Income 330 173  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,750 [2],[9],[24] 1,300  
Gross Additions 780 1,450  
Gross Reductions 0 0  
Ending balance 3,530 [5],[10],[25] 2,750 [2],[9],[24] 1,300
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 317 [5],[10],[36] 237 [2],[9],[37] 282
Investment, Identifier [Axis]: Clad-Rex Steel, LLC | Member Units 3      
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 317 236  
Investment, Identifier [Axis]: Clad-Rex Steel, 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],[29] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 0 [5],[10],[21] $ 0 [2],[9],[29] 0
Investment, Identifier [Axis]: Clad-Rex Steel, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.00% [10] 9.00% [9]  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   46  
Amount of Interest, Fees or Dividends Credited to Income   219  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 1,690 [2],[9] 2,103  
Gross Additions   37  
Gross Reductions   450  
Ending balance 2,370 [5],[10] 1,690 [2],[9] 2,103
Investment, Identifier [Axis]: Clad-Rex Steel, LLC | Secured Debt 2.1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) (9)    
Amount of Interest, Fees or Dividends Credited to Income 98    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,690    
Gross Additions 0    
Gross Reductions 1,690    
Ending balance $ 0 $ 1,690  
Investment, Identifier [Axis]: Clad-Rex Steel, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 10.00% [10] 10.00% [9]  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   2  
Amount of Interest, Fees or Dividends Credited to Income   25  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 243 [2],[9] 251  
Gross Additions   2  
Gross Reductions   10  
Ending balance $ 232 [5],[10] 243 [2],[9] 251
Investment, Identifier [Axis]: Clad-Rex Steel, LLC | Secured Debt 3.1      
Schedule of Investments [Line Items]      
Total Rate 10.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 22    
Amount of Interest, Fees or Dividends Credited to Income 107    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 2,450    
Gross Reductions 80    
Ending balance $ 2,370 0  
Investment, Identifier [Axis]: Clad-Rex Steel, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 10.00%    
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 243    
Gross Additions 0    
Gross Reductions 11    
Ending balance 232 243  
Investment, Identifier [Axis]: Clarius BIGS, LLC | Secured Debt      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[32],[33] 19    
Ending balance 8 [5],[14],[17],[19],[46] 19 [2],[12],[23],[32],[33]  
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],[24] 710    
Ending balance 510 [5],[14] 710 [2],[12],[24]  
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) (680) (1,170)  
Amount of Interest, Fees or Dividends Credited to Income 443 407  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 16,950 [2],[9],[24],[37] 18,120  
Gross Additions 0 0  
Gross Reductions 680 1,170  
Ending balance 16,270 [5],[10],[25],[36] 16,950 [2],[9],[24],[37] 18,120
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) 16 1  
Amount of Interest, Fees or Dividends Credited to Income 39 8  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[9],[29] 0  
Gross Additions 157 236  
Gross Reductions 157 236  
Ending balance $ 0 [5],[10],[21] $ 0 [2],[9],[29] 0
Investment, Identifier [Axis]: Cody Pools, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.50% [10] 12.50% [9]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 94 (8)  
Amount of Interest, Fees or Dividends Credited to Income 811 873  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 6,598 [2],[9] 7,111  
Gross Additions 629 7  
Gross Reductions 1,336 520  
Ending balance 5,891 [5],[10] 6,598 [2],[9] 7,111
Investment, Identifier [Axis]: Colonial Electric Company LLC | Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 820    
Amount of Interest, Fees or Dividends Credited to Income 1,204    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[9],[24] 3,390    
Gross Additions 820    
Gross Reductions 0    
Ending balance 4,210 [5],[10],[25] 3,390 [2],[9],[24]  
Investment, Identifier [Axis]: Colonial Electric Company LLC | Preferred Member Units 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   (360)  
Amount of Interest, Fees or Dividends Credited to Income   503  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 600  
Gross Additions   0  
Gross Reductions   600  
Ending balance   0 600
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)   1,470  
Amount of Interest, Fees or Dividends Credited to Income   577  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 3,390 1,920  
Gross Additions   1,470  
Gross Reductions   0  
Ending balance   3,390 1,920
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],[29] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 0 [5],[10],[21] $ 0 [2],[9],[29] 0
Investment, Identifier [Axis]: Colonial Electric Company LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.00% [10] 12.00% [9]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (20) 64  
Amount of Interest, Fees or Dividends Credited to Income 357 598  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 3,578 [2],[9] 5,407  
Gross Additions 20 106  
Gross Reductions 1,403 1,935  
Ending balance 2,195 [5],[10] 3,578 [2],[9] 5,407
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) (3)  
Amount of Interest, Fees or Dividends Credited to Income 60 60  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,860 [2],[9] 1,863  
Gross Additions 0 0  
Gross Reductions 60 3  
Ending balance 1,800 [5],[10] 1,860 [2],[9] 1,863
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 4 19  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance (16) [2],[9],[29] 0  
Gross Additions 4 584  
Gross Reductions 0 600  
Ending balance $ (12) [5],[10],[21] $ (16) [2],[9],[29] 0
Investment, Identifier [Axis]: Compass Systems & Sales, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.50% [10] 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 614 616  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 4,201 [2],[9] 4,175  
Gross Additions 48 26  
Gross Reductions 0 0  
Ending balance $ 4,249 [5],[10] $ 4,201 [2],[9] 4,175
Investment, Identifier [Axis]: Computer Data Source, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 12.28% [14],[19],[22],[26] 12.93% [12],[23],[27],[35]  
Spread 8.25% [14],[19],[20],[22],[26] 8.25% [12],[23],[27],[28],[35]  
PIK Rate [14],[15],[19],[22],[26] 12.02%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[35] $ 6,118    
Ending balance $ 6,996 [5],[14],[19],[22],[26] $ 6,118 [2],[12],[23],[27],[35]  
Investment, Identifier [Axis]: Computer Data Source, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 12.02%    
Spread 8.25% [14],[19],[20],[22] 8.25% [12],[23],[27],[28],[29]  
PIK Rate [14],[15],[19],[22] 12.02%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] $ (42)    
Ending balance 16,960 [5],[14],[19],[22] $ (42) [2],[12],[23],[27],[29]  
Investment, Identifier [Axis]: Computer Data Source, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   12.92%  
Spread [12],[23],[27],[28]   8.25%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] 14,807    
Ending balance [2],[12],[23],[27]   $ 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],[38] 1,400    
Ending balance $ 1,400 [5],[14],[40],[41] $ 1,400 [2],[12],[38]  
Investment, Identifier [Axis]: Connect Telecommunications Solutions Holdings, Inc. | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 13.00% [14],[40],[41] 13.00% [12],[38]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[38] $ 2,977    
Ending balance 2,642 [5],[14],[40],[41] $ 2,977 [2],[12],[38]  
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],[38],[42],[43] 568  
Gross Additions 0 0  
Gross Reductions 140 38  
Ending balance 390 [5],[8],[40],[44],[45] $ 530 [2],[7],[38],[42],[43] 568
Investment, Identifier [Axis]: Core Transformers | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19] $ 1,000    
Investment, Identifier [Axis]: Core Transformers | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread [14],[19],[20],[21],[22] 5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[21],[22] $ (95)    
Investment, Identifier [Axis]: Core Transformers | Secured Debt 2      
Schedule of Investments [Line Items]      
Spread [14],[19],[20],[21],[22] 5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[21],[22] $ (95)    
Investment, Identifier [Axis]: Core Transformers | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 9.23%    
Spread [14],[19],[20],[22] 5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 9,811    
Investment, Identifier [Axis]: Coregistics Buyer LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.32% [14],[19],[22],[26],[40],[41] 10.39% [12],[23],[27],[38],[39]  
Spread 6.50% [14],[19],[20],[22],[26],[40],[41] 6.00% [12],[23],[27],[28],[38],[39]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[38],[39] $ 440    
Ending balance $ 445 [5],[14],[19],[22],[26],[40],[41] $ 440 [2],[12],[23],[27],[38],[39]  
Investment, Identifier [Axis]: Coregistics Buyer LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.34% [14],[19],[22],[40],[41] 10.36% [12],[23],[27],[38],[39]  
Spread 6.50% [14],[19],[20],[22],[40],[41] 6.00% [12],[23],[27],[28],[38],[39]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[38],[39] $ 2,824    
Ending balance $ 2,818 [5],[14],[19],[22],[40],[41] $ 2,824 [2],[12],[23],[27],[38],[39]  
Investment, Identifier [Axis]: Coregistics Buyer LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 10.59% [14],[19],[22],[40],[41] 10.40% [12],[23],[27],[38],[39]  
Spread 6.75% [14],[19],[20],[22],[40],[41] 6.00% [12],[23],[27],[28],[38],[39]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[38],[39] $ 1,878    
Ending balance $ 8,516 [5],[14],[19],[22],[40],[41] $ 1,878 [2],[12],[23],[27],[38],[39]  
Investment, Identifier [Axis]: Coregistics Buyer LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 10.37% [14],[19],[22],[40],[41] 10.61% [12],[23],[27],[38],[39]  
Spread 6.50% [14],[19],[20],[22],[40],[41] 6.25% [12],[23],[27],[28],[38],[39]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[38],[39] $ 8,109    
Ending balance 1,879 [5],[14],[19],[22],[40],[41] $ 8,109 [2],[12],[23],[27],[38],[39]  
Investment, Identifier [Axis]: Creative Foam Corporation | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19] $ 230    
Investment, Identifier [Axis]: Creative Foam Corporation | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 6.75% [14],[19],[21],[22] 5.75% [12],[23],[27],[28],[29]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] $ (28)    
Ending balance $ (22) [5],[14],[19],[21],[22] $ (28) [2],[12],[23],[27],[29]  
Investment, Identifier [Axis]: Creative Foam Corporation | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.69% [14],[19],[22] 10.11% [12],[23],[27]  
Spread 6.75% [14],[19],[22] 5.75% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 10,694    
Ending balance $ 16,578 [5],[14],[19],[22] $ 10,694 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Creative Foam Corporation | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 10.44%    
Spread [14],[19],[20],[22] 6.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 10,400    
Investment, Identifier [Axis]: DMA Industries, LLC | Preferred Equity 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 810 (434)  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,486 [2],[9] 1,920  
Gross Additions 810 0  
Gross Reductions 0 434  
Ending balance $ 2,296 [5],[10] $ 1,486 [2],[9] 1,920
Investment, Identifier [Axis]: DMA Industries, LLC | Preferred Equity 2      
Schedule of Investments [Line Items]      
Total Rate 15.00% [10],[25] 15.00% [9],[24]  
PIK Rate 15.00% [10],[15],[25] 15.00% [9],[16],[24]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 420 0  
Amount of Interest, Fees or Dividends Credited to Income 128 43  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 810 [2],[9],[24] 0  
Gross Additions 548 810  
Gross Reductions 0 0  
Ending balance $ 1,358 [5],[10],[25] $ 810 [2],[9],[24] 0
Investment, Identifier [Axis]: DMA Industries, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.00% [10] 12.00% [9]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 2 0  
Amount of Interest, Fees or Dividends Credited to Income 17 9  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 138 [2],[9] 0  
Gross Additions 2 138  
Gross Reductions 0 0  
Ending balance $ 140 [5],[10] $ 138 [2],[9] 0
Investment, Identifier [Axis]: DMA Industries, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.00% [10] 12.00% [9]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 23 (58)  
Amount of Interest, Fees or Dividends Credited to Income 484 555  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 4,161 [2],[9] 4,700  
Gross Additions 39 19  
Gross Reductions 1,000 558  
Ending balance $ 3,200 [5],[10] $ 4,161 [2],[9] 4,700
Investment, Identifier [Axis]: DTE Enterprises, LLC | Class A Preferred Member Units      
Schedule of Investments [Line Items]      
Total Rate 8.00% [14],[19] 8.00% [12],[23]  
PIK Rate 8.00% [14],[15],[19] 8.00% [12],[16],[23]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] $ 0    
Ending balance $ 0 [5],[14],[19] $ 0 [2],[12],[23]  
Investment, Identifier [Axis]: DTE Enterprises, LLC | Class AA Preferred Member Units (non-voting)      
Schedule of Investments [Line Items]      
Total Rate 10.00% [14],[19] 10.00% [12],[23],[24]  
PIK Rate 10.00% [14],[15],[19] 10.00% [12],[16],[23],[24]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[24] $ 438    
Ending balance 0 [5],[14],[19] $ 438 [2],[12],[23],[24]  
Investment, Identifier [Axis]: Dalton US Inc. | Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] 50    
Ending balance 50 [5],[14],[19] 50 [2],[12],[23]  
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) 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 30 [2],[9] 10  
Gross Additions 40 20  
Gross Reductions 70 0  
Ending balance $ 0 [5],[10] $ 30 [2],[9] 10
Investment, Identifier [Axis]: Datacom, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 7.50% [10] 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 7 4  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 55 [2],[9] 49  
Gross Additions 85 66  
Gross Reductions 65 60  
Ending balance $ 75 [5],[10] $ 55 [2],[9] 49
Investment, Identifier [Axis]: Datacom, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.00% [10] 10.00% [9]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (405) 43  
Amount of Interest, Fees or Dividends Credited to Income 109 114  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 878 [2],[9] 844  
Gross Additions 20 64  
Gross Reductions 435 30  
Ending balance 463 [5],[10] 878 [2],[9] 844
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 50 50  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,459 [2],[9],[24] 2,459  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 2,459 [5],[10],[25] $ 2,459 [2],[9],[24] 2,459
Investment, Identifier [Axis]: Digital Products Holdings LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 13.88% [10],[22] 14.56% [9],[27]  
Spread 10.00% [10],[20],[22] 10.00% [9],[27],[28]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (117) (18)  
Amount of Interest, Fees or Dividends Credited to Income 446 532  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 3,105 [2],[9],[27] 3,673  
Gross Additions 11 14  
Gross Reductions 282 582  
Ending balance 2,834 [5],[10],[22] 3,105 [2],[9],[27] 3,673
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) 460 (700)  
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 460 0  
Gross Reductions 0 700  
Ending balance $ 4,940 [5],[10] 4,480 [2],[9] 5,180
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [10] 14.00%    
Amount of Realized Gain/(Loss) $ 0 0  
Amount of Unrealized Gain/(Loss) (2) (2)  
Amount of Interest, Fees or Dividends Credited to Income 15 11  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[9],[29] 217  
Gross Additions 317 302  
Gross Reductions 2 519  
Ending balance $ 315 [5],[10] $ 0 [2],[9],[29] 217
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 14.00% [10] 14.00% [9]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (12) (14)  
Amount of Interest, Fees or Dividends Credited to Income 656 700  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 4,668 [2],[9] 5,002  
Gross Additions 12 14  
Gross Reductions 179 348  
Ending balance 4,501 [5],[10] 4,668 [2],[9] 5,002
Investment, Identifier [Axis]: Dynamic Communities, LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] 0    
Ending balance 0 [5],[14],[19] 0 [2],[12],[23]  
Investment, Identifier [Axis]: Dynamic Communities, LLC | Preferred Equity 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] 60    
Ending balance 110 [5],[14],[19] 60 [2],[12],[23]  
Investment, Identifier [Axis]: Dynamic Communities, LLC | Preferred Equity 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] 0    
Ending balance $ 0 [5],[14],[19] $ 0 [2],[12],[23]  
Investment, Identifier [Axis]: Dynamic Communities, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.82% [14],[19],[22] 11.46% [12],[23],[27]  
Spread 8.00% [14],[19],[20],[22] 7.00% [12],[23],[27],[28]  
PIK Rate 11.82% [14],[15],[19],[22] 11.46% [12],[16],[23],[27]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 2,220    
Ending balance $ 2,612 [5],[14],[19],[22] $ 2,220 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Dynamic Communities, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.82% [14],[19],[22] 13.46% [12],[23],[27]  
Spread 9.00% [14],[19],[20],[22] 9.00% [12],[23],[27],[28]  
PIK Rate [12],[16],[23],[27]   13.46%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 2,219    
Ending balance 2,464 [5],[14],[19],[22] $ 2,219 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Electro Technical Industries, LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19] $ 1,080    
Investment, Identifier [Axis]: Electro Technical Industries, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread [14],[19],[20],[21],[22] 5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[21],[22] $ (73)    
Investment, Identifier [Axis]: Electro Technical Industries, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 9.22%    
Spread [14],[19],[20],[22] 5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 24,466    
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 330 [5],[14] 370 [2],[12]  
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 $ 214 [5],[14],[36] $ 199 [2],[12],[37]  
Investment, Identifier [Axis]: Elgin AcquireCo, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 6.00% [14],[20],[21],[22] 6.00% [12],[27],[28],[29]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[27],[29] $ 0    
Ending balance $ 0 [5],[14],[21],[22] $ 0 [2],[12],[27],[29]  
Investment, Identifier [Axis]: Elgin AcquireCo, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 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 $ 1,085 [5],[14] $ 1,162 [2],[12]  
Investment, Identifier [Axis]: Elgin AcquireCo, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 9.00% [14] 9.00% [12]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12] $ 406    
Ending balance $ 402 [5],[14] $ 406 [2],[12]  
Investment, Identifier [Axis]: Emerald Technologies Acquisition Co, Inc. | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 10.22% [13],[14],[22] 10.71% [11],[12],[27]  
Spread 6.25% [13],[14],[20],[22] 6.25% [11],[12],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[12],[27] $ 1,863    
Ending balance 1,427 [5],[13],[14],[22] $ 1,863 [2],[11],[12],[27]  
Investment, Identifier [Axis]: Escalent, Inc. | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] 240    
Ending balance $ 240 [5],[19] $ 240 [2],[12],[23]  
Investment, Identifier [Axis]: Escalent, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 6.00% [14],[19],[20],[21],[22] 8.00% [12],[23],[27],[28],[29]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] $ (7)    
Ending balance $ 0 [5],[19],[21],[22] $ (7) [2],[12],[23],[27],[29]  
Investment, Identifier [Axis]: Escalent, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.67% [19],[22] 12.39% [12],[23],[27]  
Spread 6.00% [19],[20],[22] 8.00% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 358    
Ending balance $ 356 [5],[19],[22] $ 358 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Escalent, Inc. | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 9.67% [19],[22] 12.43% [12],[23],[27]  
Spread 6.00% [19],[20],[22] 8.00% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 6,855    
Ending balance $ 6,715 [5],[19],[22] $ 6,855 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Event Holdco, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.93% [14],[19],[22] 12.59% [12],[23],[27]  
Spread 7.00% [14],[19],[20],[22] 8.00% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 308    
Ending balance $ 308 [5],[14],[19],[22] $ 308 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Event Holdco, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.93% [14],[19],[22] 12.59% [12],[23],[27]  
Spread 7.00% [14],[19],[20],[22] 8.00% [12],[23],[27],[28]  
PIK Rate [12],[16],[23],[27]   6.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 3,969    
Ending balance 4,003 [5],[14],[19],[22] $ 3,969 [2],[12],[23],[27]  
Investment, Identifier [Axis]: FCC Intermediate Holdco, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate [12]   13.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12] 7,135    
Ending balance [2],[12]   $ 7,135  
Investment, Identifier [Axis]: FCC Intermediate Holdco, LLC | Secured Debt 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[21] $ 0    
Investment, Identifier [Axis]: FCC Intermediate Holdco, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [14] 13.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14] $ 7,790    
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 $ 3,780 [5],[14],[25],[34] $ 2,710 [2],[12],[18]  
Investment, Identifier [Axis]: First American Treasury Obligations Fund Class Z      
Schedule of Investments [Line Items]      
Total Rate 3.67% 4.41%  
Investment, Identifier [Axis]: Flame King Holdings, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 4,680 2,010  
Amount of Interest, Fees or Dividends Credited to Income 2,175 1,229  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 8,980 [2],[9],[24] 6,970  
Gross Additions 4,680 2,010  
Gross Reductions 0 0  
Ending balance 13,660 [5],[10],[25] 8,980 [2],[9],[24] 6,970
Investment, Identifier [Axis]: Flame King Holdings, LLC | Secured Debt 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[10],[21] $ 0    
Investment, Identifier [Axis]: Flame King Holdings, LLC | Secured Debt 1.1      
Schedule of Investments [Line Items]      
Total Rate 12.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 292    
Amount of Interest, Fees or Dividends Credited to Income 1,055    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 16,500    
Gross Reductions 0    
Ending balance $ 16,500 0  
Investment, Identifier [Axis]: Flame King Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [10] 12.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[10] $ 16,500    
Investment, Identifier [Axis]: Flame King Holdings, LLC | Secured Debt 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 5    
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]: 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) 59  
Amount of Interest, Fees or Dividends Credited to Income 0 41  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,263 [2],[9],[24],[38],[42],[43] 3,705  
Gross Additions 0 58  
Gross Reductions 1,070 2,500  
Ending balance 193 [5],[10],[40],[44],[45] 1,263 [2],[9],[24],[38],[42],[43] 3,705
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 232 453  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,640 [2],[9],[24] 2,870  
Gross Additions 100 0  
Gross Reductions 0 230  
Ending balance $ 2,740 [5],[10],[25] $ 2,640 [2],[9],[24] 2,870
Investment, Identifier [Axis]: GFG Group, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 8.00% [10] 8.00% [9]  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (17)  
Amount of Interest, Fees or Dividends Credited to Income   198  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 2,046 [2],[9] 2,336  
Gross Additions   17  
Gross Reductions   307  
Ending balance 3,513 [5],[10] 2,046 [2],[9] 2,336
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 2,046  
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%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 7    
Amount of Interest, Fees or Dividends Credited to Income 153    
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 0  
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) 230 710  
Amount of Interest, Fees or Dividends Credited to Income 2,608 113  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 22,600 [2],[7] 21,890  
Gross Additions 230 710  
Gross Reductions 0 0  
Ending balance $ 22,830 [5],[8],[25] $ 22,600 [2],[7] 21,890
Investment, Identifier [Axis]: GRT Rubber Technologies LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.98% [8] 10.66% [7]  
Spread 6.00% [8],[20] 6.00% [7],[28]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (6) 2  
Amount of Interest, Fees or Dividends Credited to Income 169 167  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,550 [2],[7] 1,182  
Gross Additions 6 368  
Gross Reductions 6 0  
Ending balance $ 1,550 [5],[8] $ 1,550 [2],[7] 1,182
Investment, Identifier [Axis]: GRT Rubber Technologies LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.98% [8] 12.66% [7]  
Spread 8.00% [8],[20] 8.00% [7],[28]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (50) (50)  
Amount of Interest, Fees or Dividends Credited to Income 2,552 2,746  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 19,944 [2],[7] 19,944  
Gross Additions 50 50  
Gross Reductions 50 50  
Ending balance 19,944 [5],[8] 19,944 [2],[7] 19,944
Investment, Identifier [Axis]: Gamber-Johnson Holdings, 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 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 99    
Gross Reductions 0    
Ending balance 99 [5],[10],[36] 0  
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) (240) 4,510  
Amount of Interest, Fees or Dividends Credited to Income 1,744 1,984  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 28,690 [2],[9],[24] 24,180  
Gross Additions 0 4,510  
Gross Reductions 240 0  
Ending balance $ 28,450 [5],[10],[25] $ 28,690 [2],[9],[24] 24,180
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 7.50% [10],[20],[21],[22],[47] 7.00% [9],[27],[28],[29],[48]  
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],[27],[29],[48] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 0 [5],[10],[21],[22],[47] $ 0 [2],[9],[27],[29],[48] 0
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.38% [10],[22] 11.00% [9],[27],[48]  
Spread 7.50% [10],[20],[22] 7.00% [9],[27],[28],[48]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (40) 115  
Amount of Interest, Fees or Dividends Credited to Income 2,144 181  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 18,282 [2],[9],[27],[48] 0  
Gross Additions 40 18,282  
Gross Reductions 690 0  
Ending balance 17,632 [5],[10],[22] $ 18,282 [2],[9],[27],[48] 0
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Spread   7.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (184)  
Amount of Interest, Fees or Dividends Credited to Income   1,395  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 13,520  
Gross Additions   0  
Gross Reductions   13,520  
Ending balance   0 13,520
Investment, Identifier [Axis]: Garyline, LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] 150    
Ending balance $ 130 [5],[14],[19] $ 150 [2],[12],[23]  
Investment, Identifier [Axis]: Garyline, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27],[35]   11.29%  
Spread 7.25% [14],[19],[20],[21],[22] 6.75% [12],[23],[27],[28],[35]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[35] $ 2,416    
Ending balance $ 0 [5],[14],[19],[21],[22] $ 2,416 [2],[12],[23],[27],[35]  
Investment, Identifier [Axis]: Garyline, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.98% [14],[19],[22] 11.34% [12],[23],[27]  
Spread 7.25% [14],[19],[20],[22] 6.75% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 9,567    
Ending balance 8,514 [5],[14],[19],[22] $ 9,567 [2],[12],[23],[27]  
Investment, Identifier [Axis]: GradeEight Corp. | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] 471    
Ending balance $ 423 [5],[14],[19] $ 471 [2],[12],[23]  
Investment, Identifier [Axis]: GradeEight Corp. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 11.23%    
Spread 7.50% [14],[19],[20],[22] 7.25% [12],[23],[27],[28],[29]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] $ (45)    
Ending balance $ 391 [5],[14],[19],[22] $ (45) [2],[12],[23],[27],[29]  
Investment, Identifier [Axis]: GradeEight Corp. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 11.23%    
Spread 7.50% [14],[19],[20],[22] 7.25% [12],[23],[27],[28],[29]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] $ (22)    
Ending balance $ 1,922 [5],[14],[19],[22] $ (22) [2],[12],[23],[27],[29]  
Investment, Identifier [Axis]: GradeEight Corp. | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 11.31% [14],[19],[22],[49] 11.74% [12],[23],[27]  
Spread 7.25% [14],[19],[20],[22],[49] 7.25% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 14,542    
Ending balance 14,136 [5],[14],[19],[22],[49] $ 14,542 [2],[12],[23],[27]  
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 [2],[9] 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 [2],[9] 620
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 9.50% 9.50% [9],[27],[28],[29],[32]  
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],[27],[29],[32] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance 0 $ 0 [2],[9],[27],[29],[32] 0
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [9],[32]   12.50%  
PIK Rate [9],[16],[32]   12.50%  
Amount of Realized Gain/(Loss) (58) $ 0  
Amount of Unrealized Gain/(Loss) 202 (173)  
Amount of Interest, Fees or Dividends Credited to Income 0 20  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 378 [2],[9],[32] 571  
Gross Additions 156 0  
Gross Reductions 534 193  
Ending balance 0 378 [2],[9],[32] 571
Investment, Identifier [Axis]: HDC/HW Intermediate Holdings | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] 0    
Ending balance $ 0 [5],[14],[19] $ 0 [2],[12],[23]  
Investment, Identifier [Axis]: HDC/HW Intermediate Holdings | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.01% [14],[17],[19],[22] 8.75% [12],[23],[27]  
Spread 3.50% [14],[17],[19],[20],[22] 3.50% [12],[23],[27],[28]  
PIK Rate 2.50% [14],[15],[17],[19],[22] 2.50% [12],[16],[23],[27]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 1,307    
Ending balance $ 1,276 [5],[14],[17],[19],[22] $ 1,307 [2],[12],[23],[27]  
Investment, Identifier [Axis]: HDC/HW Intermediate Holdings | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 2.50% [14],[17],[19] 2.50% [12],[23],[32]  
PIK Rate 2.50% [14],[15],[17],[19] 2.50% [12],[16],[23],[32]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[32] $ 235    
Ending balance 0 [5],[14],[17],[19] $ 235 [2],[12],[23],[32]  
Investment, Identifier [Axis]: HEADLANDS OP-CO LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread [12],[23],[27],[28],[29]   6.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] (10)    
Ending balance [2],[12],[23],[27],[29]   $ (10)  
Investment, Identifier [Axis]: HEADLANDS OP-CO LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   10.86%  
Spread [12],[23],[27],[28]   6.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] 1,975    
Ending balance [2],[12],[23],[27]   $ 1,975  
Investment, Identifier [Axis]: HEADLANDS OP-CO LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   10.86%  
Spread [12],[23],[27],[28]   6.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] 1,396    
Ending balance [2],[12],[23],[27]   $ 1,396  
Investment, Identifier [Axis]: HEADLANDS OP-CO LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   10.86%  
Spread [12],[23],[27],[28]   6.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] 4,875    
Ending balance [2],[12],[23],[27]   $ 4,875  
Investment, Identifier [Axis]: HEADLANDS OP-CO LLC | Secured Debt 5      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   10.86%  
Spread [12],[23],[27],[28]   6.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] 2,382    
Ending balance [2],[12],[23],[27]   $ 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) 391 247  
Amount of Interest, Fees or Dividends Credited to Income 5 1  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 4,472 4,225  
Gross Additions 391 247  
Gross Reductions 747 0  
Ending balance 4,116 4,472 4,225
Investment, Identifier [Axis]: Harris Preston Fund Investments | LP Interests (2717 MH, L.P.)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 5,295 147  
Amount of Unrealized Gain/(Loss) (4,655) 2,691  
Amount of Interest, Fees or Dividends Credited to Income 0 311  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 8,740 [2],[7],[24],[38],[42],[43] 6,050  
Gross Additions 3,875 2,837  
Gross Reductions 10,718 147  
Ending balance 1,897 [5],[8],[44] 8,740 [2],[7],[24],[38],[42],[43] 6,050
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],[40],[44],[45] 1,590    
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],[38],[42],[43] 4,472    
Ending balance 4,116 [5],[10],[40],[44],[45] 4,472 [2],[9],[38],[42],[43]  
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],[24] 5,060    
Ending balance 6,580 [5],[14],[25] 5,060 [2],[12],[24]  
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 $ 350 [5],[14],[36] $ 270 [2],[12],[37]  
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.98% [14],[22] 10.73% [12],[27]  
Spread 6.00% [14],[20],[22] 6.00% [12],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[27] $ 661    
Ending balance $ 805 [5],[14],[22] $ 661 [2],[12],[27]  
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.00% [14] 12.50% [12]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12] $ 9,744    
Ending balance $ 9,744 [5],[14] $ 9,744 [2],[12]  
Investment, Identifier [Axis]: Hornblower Sub, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.32% [14],[19],[22],[26] 9.92% [12],[23],[27]  
Spread 5.50% [14],[19],[20],[22],[26] 5.50% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 1,204    
Ending balance $ 2,348 [5],[14],[19],[22],[26] $ 1,204 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Hornblower Sub, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.46% [14],[19],[22] 10.11% [12],[23],[27]  
Spread 5.50% [14],[19],[20],[22] 5.50% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 15,338    
Ending balance $ 16,082 [5],[14],[19],[22] $ 15,338 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Hybrid Promotions, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 12.24% [14],[19],[22] 13.10% [12],[23],[27]  
Spread 8.25% [14],[19],[20],[22] 8.25% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 8,000    
Ending balance 8,000 [5],[14],[19],[22] $ 8,000 [2],[12],[23],[27]  
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) 2,950 460  
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 2,950 460  
Gross Reductions 0 0  
Ending balance $ 7,010 [5],[10] $ 4,060 [2],[9] 3,600
Investment, Identifier [Axis]: IG Investor, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 13.00% [10] 13.00% [9]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 15 0  
Amount of Interest, Fees or Dividends Credited to Income 62 33  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 379 [2],[9] (27)  
Gross Additions 21 406  
Gross Reductions 0 0  
Ending balance $ 400 [5],[10] $ 379 [2],[9] (27)
Investment, Identifier [Axis]: IG Investor, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.00% [10] 13.00% [9]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 130 0  
Amount of Interest, Fees or Dividends Credited to Income 1,209 1,259  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 8,693 [2],[9] 9,069  
Gross Additions 183 64  
Gross Reductions 110 440  
Ending balance $ 8,766 [5],[10] $ 8,693 [2],[9] 9,069
Investment, Identifier [Axis]: IG Parent Corporation | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 5.75% [13],[20],[21],[22] 5.75% [11],[12],[27],[28],[29]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[12],[27],[29] $ 0    
Ending balance $ 0 [5],[13],[21],[22] $ 0 [2],[11],[12],[27],[29]  
Investment, Identifier [Axis]: IG Parent Corporation | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.57% [13],[22] 10.21% [11],[12],[27]  
Spread 5.75% [13],[20],[22] 5.75% [11],[12],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[12],[27] $ 6,154    
Ending balance $ 6,138 [5],[13],[22] $ 6,154 [2],[11],[12],[27]  
Investment, Identifier [Axis]: IG Parent Corporation | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 9.57% [13],[22] 10.21% [11],[12],[27]  
Spread 5.75% [13],[20],[22] 5.75% [11],[12],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[12],[27] $ 1,922    
Ending balance $ 1,902 [5],[13],[22] $ 1,922 [2],[11],[12],[27]  
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.15% [14],[22] 13.78% [12],[27]  
Spread 7.00% [14],[20],[22] 9.00% [12],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[27] $ 295    
Ending balance $ 295 [5],[14],[22] $ 295 [2],[12],[27]  
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.15% [14],[22] 13.78% [12],[27]  
Spread 7.00% [14],[20],[22] 9.00% [12],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[27] $ 248    
Ending balance $ 1,327 [5],[14],[22] $ 248 [2],[12],[27]  
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 11.15% [14],[22] 12.78% [12],[27]  
Spread 7.00% [14],[20],[22] 8.00% [12],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[27] $ 1,110    
Ending balance $ 1,234 [5],[14],[22] $ 1,110 [2],[12],[27]  
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 11.15% [14],[22] 14.78% [12],[27]  
Spread 7.00% [14],[20],[22] 10.00% [12],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[27] $ 1,110    
Ending balance $ 1,234 [5],[14],[22] $ 1,110 [2],[12],[27]  
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Secured Debt 5      
Schedule of Investments [Line Items]      
Total Rate [14],[22] 11.15%    
Spread [14],[20],[22] 7.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[22] $ 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 $ 3,810 [5],[14],[34] 1,420 [2],[12],[18]  
Investment, Identifier [Axis]: Ignite Visibility LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 8.84%    
Spread [14],[19],[20],[22] 5.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 7,816    
Investment, Identifier [Axis]: Ignite Visibility LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 10.84%    
Spread [14],[19],[20],[22] 7.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 7,816    
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],[23] 510    
Ending balance 540 [5],[14],[19] $ 510 [2],[12],[23]  
Investment, Identifier [Axis]: Imaging Business Machines, L.L.C. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27],[35]   11.39%  
Spread [12],[23],[27],[28],[35]   7.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[35] 791    
Ending balance [2],[12],[23],[27],[35]   $ 791  
Investment, Identifier [Axis]: Imaging Business Machines, L.L.C. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   11.62%  
Spread [12],[23],[27],[28]   7.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] 10,280    
Ending balance [2],[12],[23],[27]   $ 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],[19] 4,490    
Investment, Identifier [Axis]: Implus Footcare, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   13.73%  
Spread [12],[23],[27],[28]   7.75%  
PIK Rate [12],[16],[23],[27]   1.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 14,524    
Ending balance [2],[12],[23],[27]   $ 14,524  
Investment, Identifier [Axis]: Implus Footcare, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 9.68%    
Spread [14],[19],[20],[22] 6.00%    
PIK Rate [14],[15],[19],[22] 4.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 1,776    
Investment, Identifier [Axis]: Implus Footcare, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 9.68%    
Spread [14],[19],[20],[22] 6.00%    
PIK Rate [14],[15],[19],[22] 9.68%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 4,044    
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 36 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 7,290 [2],[9],[23] 6,320  
Gross Additions 0 970  
Gross Reductions 500 0  
Ending balance 6,790 [5],[10],[19] 7,290 [2],[9],[23] 6,320
Investment, Identifier [Axis]: Infinity X1 Holdings, LLC | Preferred Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[24] 2,310    
Ending balance $ 2,040 [5],[14],[25] $ 2,310 [2],[12],[24]  
Investment, Identifier [Axis]: Infinity X1 Holdings, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 12.00% [14] 12.00% [12]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12] $ 3,763    
Ending balance 3,825 [5],[14] $ 3,763 [2],[12]  
Investment, Identifier [Axis]: Insight Borrower Corporation | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] 120    
Ending balance $ 100 [5],[14],[19] $ 120 [2],[12],[23]  
Investment, Identifier [Axis]: Insight Borrower Corporation | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 10.10%    
Spread 6.25% [14],[19],[20],[22] 6.25% [12],[23],[27],[28],[29]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] $ (32)    
Ending balance $ 1,574 [5],[14],[19],[22] $ (32) [2],[12],[23],[27],[29]  
Investment, Identifier [Axis]: Insight Borrower Corporation | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 10.12%    
Spread 6.25% [14],[19],[20],[22] 6.25% [12],[23],[27],[28],[29]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] $ (27)    
Ending balance 15,424 [5],[14],[19],[22] $ (27) [2],[12],[23],[27],[29]  
Investment, Identifier [Axis]: Insight Borrower Corporation | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   10.87%  
Spread [12],[23],[27],[28]   6.25%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] 7,869    
Ending balance [2],[12],[23],[27]   $ 7,869  
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] 21    
Ending balance $ 75 [5],[14],[19] $ 21 [2],[12],[23]  
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 13.97% [14],[19],[22],[26] 14.69% [12],[23],[27],[35]  
Spread 10.00% [14],[19],[20],[22],[26] 10.00% [12],[23],[27],[28],[35]  
PIK Rate [14],[15],[19],[22],[26] 2.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[35] $ 620    
Ending balance $ 691 [5],[14],[19],[22],[26] $ 620 [2],[12],[23],[27],[35]  
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.97% [14],[19],[22] 14.58% [12],[23],[27]  
Spread 10.00% [14],[19],[20],[22] 10.00% [12],[23],[27],[28]  
PIK Rate [14],[15],[19],[22] 2.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 5,681    
Ending balance $ 5,901 [5],[14],[19],[22] $ 5,681 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 13.97% [14],[19],[22] 14.58% [12],[23],[27]  
Spread 10.00% [14],[19],[20],[22] 10.00% [12],[23],[27],[28]  
PIK Rate [14],[15],[19],[22] 2.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 1,144    
Ending balance $ 1,188 [5],[14],[19],[22] $ 1,144 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 13.97%    
Spread [14],[19],[20],[22] 10.00%    
PIK Rate [14],[15],[19],[22] 2.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 274    
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) (230) 450  
Amount of Interest, Fees or Dividends Credited to Income 0 50  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 640 [2],[9],[23] 190  
Gross Additions 0 450  
Gross Reductions 230 0  
Ending balance 410 [5],[10],[19] $ 640 [2],[9],[23] 190
Investment, Identifier [Axis]: Integral Energy Services | Preferred Equity      
Schedule of Investments [Line Items]      
Total Rate [9],[23],[24]   10.00%  
PIK Rate [9],[16],[23],[24]   10.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   153  
Amount of Interest, Fees or Dividends Credited to Income   32  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 535 [2],[9],[23],[24] 350  
Gross Additions   185  
Gross Reductions   0  
Ending balance   535 [2],[9],[23],[24] 350
Investment, Identifier [Axis]: Integral Energy Services | Preferred Equity 1      
Schedule of Investments [Line Items]      
Total Rate [10],[19],[25] 10.00%    
PIK Rate [10],[15],[19],[25] 10.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (76)    
Amount of Interest, Fees or Dividends Credited to Income 31    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 535    
Gross Additions 31    
Gross Reductions 76    
Ending balance $ 490 [5],[10],[19],[25] 535  
Investment, Identifier [Axis]: Integral Energy Services | Preferred Equity 2      
Schedule of Investments [Line Items]      
Total Rate [10],[19] 10.00%    
PIK Rate [10],[15],[19] 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 480    
Gross Reductions 0    
Ending balance $ 480 [5],[10],[19] $ 0  
Investment, Identifier [Axis]: Integral Energy Services | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 11.75% [10],[19],[22] 12.35% [9],[23],[27]  
Spread 7.50% [10],[19],[20],[22] 7.50% [9],[23],[27],[28]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (114) 390  
Amount of Interest, Fees or Dividends Credited to Income 1,881 2,138  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 14,872 [2],[9],[23],[27] 16,232  
Gross Additions 63 475  
Gross Reductions 864 1,835  
Ending balance 14,071 [5],[10],[19],[22] 14,872 [2],[9],[23],[27] 16,232
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],[23] 0    
Ending balance $ 0 [5],[14],[19] $ 0 [2],[12],[23]  
Investment, Identifier [Axis]: Interface Security Systems, L.L.C | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 13.92% [14],[19],[26],[46] 14.54% [12],[23],[33],[35]  
Spread 10.00% [14],[19],[20],[26],[46] 10.00% [12],[23],[28],[33],[35]  
PIK Rate 13.92% [14],[15],[19],[26],[46] 14.54% [12],[16],[23],[33],[35]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[33],[35] $ 1,580    
Ending balance $ 2,078 [5],[14],[19],[26],[46] $ 1,580 [2],[12],[23],[33],[35]  
Investment, Identifier [Axis]: Interface Security Systems, L.L.C | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.02% [14],[17],[19],[22],[46] 11.67% [12],[23],[27],[32],[33]  
Spread 7.00% [14],[17],[19],[20],[22],[46] 7.00% [12],[23],[27],[28],[32],[33]  
PIK Rate 11.02% [14],[15],[17],[19],[22],[46] 11.67% [12],[16],[23],[27],[32],[33]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[32],[33] $ 13    
Ending balance $ 1 [5],[14],[17],[19],[22],[46] $ 13 [2],[12],[23],[27],[32],[33]  
Investment, Identifier [Axis]: Invincible Boat Company, LLC. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.37% [14],[19],[22],[26] 12.01% [12],[23],[27],[35]  
Spread 7.50% [14],[19],[20],[22],[26] 7.50% [12],[23],[27],[28],[35]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[35] $ 996    
Ending balance $ 1,319 [5],[14],[19],[22],[26] $ 996 [2],[12],[23],[27],[35]  
Investment, Identifier [Axis]: Invincible Boat Company, LLC. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.37% [14],[19],[22] 12.01% [12],[23],[27]  
Spread 7.50% [14],[19],[20],[22] 7.50% [12],[23],[27],[28]  
PIK Rate [14],[15],[19],[22] 3.37%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 16,098    
Ending balance 15,247 [5],[14],[19],[22] $ 16,098 [2],[12],[23],[27]  
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 680 [5],[14] $ 710 [2],[12]  
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    
Ending balance [2],[12]   $ 190  
Investment, Identifier [Axis]: Iron-Main Investments, LLC | Preferred Equity 1      
Schedule of Investments [Line Items]      
Total Rate [14] 25.00%    
PIK Rate [14],[15] 25.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14] $ 260    
Investment, Identifier [Axis]: Iron-Main Investments, LLC | Preferred Equity 2      
Schedule of Investments [Line Items]      
Total Rate [14] 25.00%    
PIK Rate [14],[15] 25.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14] $ 39    
Investment, Identifier [Axis]: Iron-Main Investments, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 13.00% [14] 13.00% [12]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12] $ 1,113    
Ending balance $ 1,118 [5],[14] $ 1,113 [2],[12]  
Investment, Identifier [Axis]: Iron-Main Investments, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.00% [14] 13.00% [12]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12] $ 725    
Ending balance $ 728 [5],[14] $ 725 [2],[12]  
Investment, Identifier [Axis]: Iron-Main Investments, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 13.00% [14] 13.00% [12]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12] $ 2,236    
Ending balance $ 2,236 [5],[14] $ 2,236 [2],[12]  
Investment, Identifier [Axis]: Iron-Main Investments, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 13.00% [14] 13.00% [12]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12] $ 4,344    
Ending balance $ 4,364 [5],[14] $ 4,344 [2],[12]  
Investment, Identifier [Axis]: Iron-Main Investments, LLC | Secured Debt 5      
Schedule of Investments [Line Items]      
Total Rate 13.00% [14] 13.00% [12]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12] $ 2,379    
Ending balance 2,335 [5],[14] $ 2,379 [2],[12]  
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 $ 0 [5],[13],[14] $ 0 [2],[11],[12]  
Investment, Identifier [Axis]: Isagenix International, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 2.50% [13],[14],[22],[50] 11.25% [11],[12],[27]  
Spread [11],[12],[27],[28]   6.60%  
PIK Rate [11],[12],[16],[27]   8.75%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[12],[27] $ 622    
Ending balance $ 429 [5],[13],[14],[22],[50] $ 622 [2],[11],[12],[27]  
Investment, Identifier [Axis]: Island Pump and Tank, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 11.25%    
Spread 7.00% [14],[19],[20],[22] 6.50% [12],[23],[27],[28],[29]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] $ (5)    
Ending balance $ 443 [5],[14],[19],[22] $ (5) [2],[12],[23],[27],[29]  
Investment, Identifier [Axis]: Island Pump and Tank, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.25% [14],[19],[22],[49] 10.35% [12],[23],[27]  
Spread 6.00% [14],[19],[20],[22],[49] 5.50% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 1,722    
Ending balance $ 2,048 [5],[14],[19],[22],[49] $ 1,722 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Island Pump and Tank, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 11.25% [14],[19],[22],[49] 11.35% [12],[23],[27]  
Spread 7.00% [14],[19],[20],[22],[49] 6.50% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 1,722    
Ending balance $ 2,048 [5],[14],[19],[22],[49] $ 1,722 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Island Pump and Tank, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 12.25% [14],[19],[22],[49] 12.35% [12],[23],[27]  
Spread 8.00% [14],[19],[20],[22],[49] 7.50% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 1,722    
Ending balance 2,048 [5],[14],[19],[22],[49] $ 1,722 [2],[12],[23],[27]  
Investment, Identifier [Axis]: JDC Power Services, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread [12],[23],[27],[28],[29]   6.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] (47)    
Ending balance [2],[12],[23],[27],[29]   $ (47)  
Investment, Identifier [Axis]: JDC Power Services, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   10.83%  
Spread [12],[23],[27],[28]   6.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] 17,489    
Ending balance [2],[12],[23],[27]   $ 17,489  
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] 30    
Ending balance [2],[12],[23]   $ 30  
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC | Common Equity 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19] 0    
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC | Common Equity 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19] $ 0    
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.13% [14],[19],[22] 12.72% [12],[23],[27],[35]  
Spread 5.00% [14],[19],[20],[22] 8.00% [12],[23],[27],[28],[35]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[35] $ 665    
Ending balance $ 526 [5],[14],[19],[22] $ 665 [2],[12],[23],[27],[35]  
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.13% [14],[19],[22] 12.58% [12],[23],[27]  
Spread 6.00% [14],[19],[20],[22] 8.00% [12],[23],[27],[28]  
PIK Rate [14],[15],[19],[22] 10.13%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 2,823    
Ending balance $ 3,036 [5],[14],[19],[22] $ 2,823 [2],[12],[23],[27]  
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 15.00% [14],[17],[19] 12.58% [12],[23],[27]  
Spread [12],[23],[27],[28]   8.00%  
PIK Rate [14],[15],[17],[19] 15.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 265    
Ending balance 78 [5],[14],[17],[19] $ 265 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Jackmont Hospitality, Inc. | Preferred Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] 1,740    
Ending balance $ 1,500 [5],[14],[19] $ 1,740 [2],[12],[23]  
Investment, Identifier [Axis]: Jackmont Hospitality, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.01% [14],[19],[22],[49] 12.18% [12],[23],[27],[51]  
Spread 7.00% [14],[19],[20],[22],[49] 7.50% [12],[23],[27],[28],[51]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[51] $ 1,585    
Ending balance $ 1,501 [5],[14],[19],[22],[49] $ 1,585 [2],[12],[23],[27],[51]  
Investment, Identifier [Axis]: Jackmont Hospitality, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.23% [14],[19],[22],[49] 12.19% [12],[23],[27]  
Spread 7.00% [14],[19],[20],[22],[49] 7.50% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 1,251    
Ending balance $ 1,251 [5],[14],[19],[22],[49] $ 1,251 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Jackmont Hospitality, Inc. | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 11.11% [14],[19],[22],[49] 12.18% [12],[23],[27]  
Spread 7.00% [14],[19],[20],[22],[49] 7.50% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 121    
Ending balance $ 1,333 [5],[14],[19],[22],[49] $ 121 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Jackmont Hospitality, Inc. | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 10.84% [14],[19],[22] 12.18% [12],[23],[27]  
Spread 7.00% [14],[19],[20],[22] 7.50% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 3,685    
Ending balance 3,476 [5],[14],[19],[22] $ 3,685 [2],[12],[23],[27]  
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    
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    
Ending 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    
Ending balance [2],[11],[12]   $ 110  
Investment, Identifier [Axis]: Joerns Healthcare, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.94% [13],[14],[22] 21.59% [11],[12],[27],[32],[33]  
Spread 8.00% [13],[14],[20],[22] 16.00% [11],[12],[27],[28],[32],[33]  
PIK Rate [11],[12],[16],[27],[32],[33]   21.59%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[12],[27],[32],[33] $ 0    
Ending balance $ 1,523 [5],[13],[14],[22] $ 0 [2],[11],[12],[27],[32],[33]  
Investment, Identifier [Axis]: Joerns Healthcare, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.94% [13],[14],[22] 21.59% [11],[12],[27],[32],[33]  
Spread 8.00% [13],[14],[20],[22] 16.00% [11],[12],[27],[28],[32],[33]  
PIK Rate [11],[12],[16],[27],[32],[33]   21.59%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[12],[27],[32],[33] $ 0    
Ending balance 1,137 [5],[13],[14],[22] $ 0 [2],[11],[12],[27],[32],[33]  
Investment, Identifier [Axis]: Joerns Healthcare, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [11],[12],[27]   13.21%  
Spread [11],[12],[27],[28]   8.75%  
PIK Rate [11],[12],[16],[27]   6.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[12],[27] 1,470    
Ending balance [2],[11],[12],[27]   $ 1,470  
Investment, Identifier [Axis]: Joerns Healthcare, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate [11],[12],[27]   13.18%  
Spread [11],[12],[27],[28]   8.75%  
PIK Rate [11],[12],[16],[27]   13.18%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[12],[27] 1,091    
Ending balance [2],[11],[12],[27]   $ 1,091  
Investment, Identifier [Axis]: JorVet Holdings, LLC | Preferred Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[24] 1,460    
Ending balance $ 1,220 [5],[14],[25] $ 1,460 [2],[12],[24]  
Investment, Identifier [Axis]: JorVet Holdings, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 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 2,578 [5],[14] $ 2,568 [2],[12]  
Investment, Identifier [Axis]: KMS, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 1,718    
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 7,831    
Gross Reductions 1    
Ending balance $ 7,830 [5],[10],[19] $ 0  
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27],[32]   14.50%  
Spread 5.50% [10],[19],[20],[21],[22] 9.75% [12],[23],[27],[28],[32]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[32] $ 829    
Ending balance $ (49) [5],[10],[19],[21],[22] $ 829 [2],[12],[23],[27],[32]  
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 1.1      
Schedule of Investments [Line Items]      
Spread 9.75%    
Amount of Realized Gain/(Loss) $ (511)    
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 $ 829  
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.50% [10],[19] 14.23% [12],[23],[27]  
Spread [12],[23],[27],[28]   9.75%  
PIK Rate [12],[16],[23],[27]   14.23%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 562    
Ending balance $ 1,433 [5],[10],[19] $ 562 [2],[12],[23],[27]  
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 2.1      
Schedule of Investments [Line Items]      
Spread 9.75%    
Amount of Realized Gain/(Loss) $ (3,791)    
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 $ 5,973  
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 12.50% [10],[19] 14.23% [12],[23],[27]  
Spread [12],[23],[27],[28]   9.75%  
PIK Rate [12],[16],[23],[27]   14.23%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 550    
Ending balance $ 1,259 [5],[10],[19] $ 550 [2],[12],[23],[27]  
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 3.1      
Schedule of Investments [Line Items]      
Spread 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 $ 562  
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27],[32]   14.50%  
Spread [12],[23],[27],[28],[32]   9.75%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[32] $ 5,973    
Ending balance [2],[12],[23],[27],[32]   $ 5,973  
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 4.1      
Schedule of Investments [Line Items]      
Spread 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 $ 0 550  
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 5.1      
Schedule of Investments [Line Items]      
Spread 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 6.1      
Schedule of Investments [Line Items]      
Total Rate 12.50%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 180    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 1,433    
Gross Reductions 0    
Ending balance $ 1,433 0  
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 7.1      
Schedule of Investments [Line Items]      
Total Rate 12.50%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 155    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 1,504    
Gross Reductions 245    
Ending balance $ 1,259 0  
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 8.1      
Schedule of Investments [Line Items]      
Spread 5.50%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 0    
Gross Reductions 49    
Ending balance (49) 0  
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) 370 (5)  
Amount of Interest, Fees or Dividends Credited to Income 24 31  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 678 [2],[9],[24],[37] 683  
Gross Additions 370 0  
Gross Reductions 0 5  
Ending balance 1,048 [5],[10],[25],[36] 678 [2],[9],[24],[37] 683
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) 1,230 640  
Amount of Interest, Fees or Dividends Credited to Income 407 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 3,060 [2],[9] 2,420  
Gross Additions 1,230 640  
Gross Reductions 0 0  
Ending balance $ 4,290 [5],[10],[25] $ 3,060 [2],[9] 2,420
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.50% [10] 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 412 543  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 3,741 [2],[9] 4,933  
Gross Additions 6 8  
Gross Reductions 1,200 1,200  
Ending balance $ 2,547 [5],[10] $ 3,741 [2],[9] 4,933
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.00% [10] 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 89 88  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 982 [2],[9] 951  
Gross Additions 0 42  
Gross Reductions 12 11  
Ending balance 970 [5],[10] $ 982 [2],[9] 951
Investment, Identifier [Axis]: LL Management, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   11.89%  
Spread [12],[23],[27],[28]   7.25%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] 701    
Ending balance [2],[12],[23],[27]   $ 701  
Investment, Identifier [Axis]: LL Management, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   11.92%  
Spread [12],[23],[27],[28]   7.25%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] 7,850    
Ending balance [2],[12],[23],[27]   $ 7,850  
Investment, Identifier [Axis]: LL Management, Inc. | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   11.71%  
Spread [12],[23],[27],[28]   7.25%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] 5,181    
Ending balance [2],[12],[23],[27]   $ 5,181  
Investment, Identifier [Axis]: LL Management, Inc. | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   11.92%  
Spread [12],[23],[27],[28]   7.25%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] 860    
Ending balance [2],[12],[23],[27]   $ 860  
Investment, Identifier [Axis]: LL Management, Inc. | Secured Debt 5      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   11.71%  
Spread [12],[23],[27],[28]   7.25%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 8,716    
Ending balance [2],[12],[23],[27]   $ 8,716  
Investment, Identifier [Axis]: LLFlex, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 12.14% [14],[19],[22] 12.74% [12],[23],[27]  
Spread 8.00% [14],[19],[20],[22] 8.00% [12],[23],[27],[28]  
PIK Rate 3.00% [14],[15],[19],[22] 3.00% [12],[16],[23],[27]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 3,684    
Ending balance 3,698 [5],[14],[19],[22] $ 3,684 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Lightbox Holdings, L.P. | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate [11],[12]   9.44%  
Spread [11],[12],[28]   5.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[12] 5,534    
Ending balance [2],[11],[12]   $ 5,534  
Investment, Identifier [Axis]: Logix Acquisition Company, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27],[33]   12.25%  
Spread [12],[23],[27],[28],[33]   4.25%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[33] $ 9,191    
Ending balance [2],[12],[23],[27],[33]   $ 9,191  
Investment, Identifier [Axis]: Logix Acquisition Company, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 11.41%    
Spread [14],[19],[20],[22] 7.50%    
PIK Rate [14],[15],[19],[22] 2.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 20,551    
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],[19] 1,027    
Investment, Identifier [Axis]: MCT Purchaserco Holding Inc. | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[40],[41] $ 619    
Investment, Identifier [Axis]: MCT Purchaserco Holding Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22],[40],[41] 9.36%    
Spread [14],[19],[20],[22],[40],[41] 5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22],[40],[41] $ 3,250    
Investment, Identifier [Axis]: MCT Purchaserco Holding Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22],[40],[41] 9.29%    
Spread [14],[19],[20],[22],[40],[41] 5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22],[40],[41] $ 21,375    
Investment, Identifier [Axis]: MH Corbin Holding LLC | Preferred Member Units 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   (1,100)  
Amount of Unrealized Gain/(Loss)   1,020  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 80  
Gross Additions   1,020  
Gross Reductions   1,100  
Ending balance   0 80
Investment, Identifier [Axis]: MH Corbin Holding LLC | Preferred Member Units 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   (1,500)  
Amount of Unrealized Gain/(Loss)   1,500  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 0  
Gross Additions   1,500  
Gross Reductions   1,500  
Ending balance   0 0
Investment, Identifier [Axis]: MH Corbin Holding LLC | Secured Debt      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   (960)  
Amount of Unrealized Gain/(Loss)   95  
Amount of Interest, Fees or Dividends Credited to Income   139  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 1,256  
Gross Additions   94  
Gross Reductions   1,350  
Ending balance   $ 0 1,256
Investment, Identifier [Axis]: Mako Steel, LP | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread [12],[23],[27],[28],[29]   7.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] 0    
Ending balance [2],[12],[23],[27],[29]   $ 0  
Investment, Identifier [Axis]: Mako Steel, LP | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   12.00%  
Spread [12],[23],[27],[28]   7.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] 21,081    
Ending balance [2],[12],[23],[27]   $ 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 $ 720 [5],[14],[25] $ 500 [2],[12]  
Investment, Identifier [Axis]: Metalforming Holdings, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Total Rate 8.00% [14],[25] 8.00% [12],[24]  
PIK Rate 8.00% [14],[15],[25] 8.00% [12],[16],[24]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[24] $ 470    
Ending balance 434 [5],[14],[25] $ 470 [2],[12],[24]  
Investment, Identifier [Axis]: Metalforming Holdings, LLC | Secured Debt 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[29] 0    
Ending balance $ 0 [5],[14],[21],[46] $ 0 [2],[12],[29]  
Investment, Identifier [Axis]: Metalforming Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 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 $ 1,266 [5],[14] $ 1,513 [2],[12]  
Investment, Identifier [Axis]: Microbe Formulas, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 5.50% [14],[19],[20],[21],[22] 5.75% [12],[23],[27],[28],[29]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] $ (5)    
Ending balance $ (3) [5],[14],[19],[21],[22] $ (5) [2],[12],[23],[27],[29]  
Investment, Identifier [Axis]: Microbe Formulas, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.32% [14],[19],[22] 10.22% [12],[23],[27]  
Spread 5.50% [14],[19],[20],[22] 5.75% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 1,342    
Ending balance $ 1,328 [5],[14],[19],[22] $ 1,342 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Microbe Formulas, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 9.32% [14],[19],[22] 10.21% [12],[23],[27]  
Spread 5.50% [14],[19],[20],[22] 5.75% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 2,389    
Ending balance 1,673 [5],[14],[19],[22] $ 2,389 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Mills Fleet Farm Group, 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   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 11,166 [2],[9],[23],[37] 0  
Gross Additions   11,166  
Gross Reductions   0  
Ending balance   11,166 [2],[9],[23],[37] 0
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 892    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 11,166    
Gross Additions 893    
Gross Reductions 1,925    
Ending balance 10,134 [5],[10],[19],[25],[36] $ 11,166  
Investment, Identifier [Axis]: Mills Fleet Farm Group, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Spread   7.00%  
Amount of Realized Gain/(Loss)   $ (5,022)  
Amount of Unrealized Gain/(Loss)   339  
Amount of Interest, Fees or Dividends Credited to Income   1,820  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 0 17,524  
Gross Additions   0  
Gross Reductions   17,524  
Ending balance   0 17,524
Investment, Identifier [Axis]: Mills Fleet Farm Group, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [10],[19],[22] 9.81%    
Spread [10],[19],[20],[22] 5.50%    
PIK Rate [10],[15],[19],[22] 9.81%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (86)    
Amount of Interest, Fees or Dividends Credited to Income 207    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 2,308    
Gross Reductions 52    
Ending balance $ 2,256 [5],[10],[19],[22] 0  
Investment, Identifier [Axis]: Mills Fleet Farm Group, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [10],[19],[22] 9.32%    
Spread [10],[19],[20],[22] 5.50%    
PIK Rate [10],[15],[19],[22] 9.32%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (51)    
Amount of Interest, Fees or Dividends Credited to Income 48    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 1,380    
Gross Reductions 36    
Ending balance 1,344 [5],[10],[19],[22] 0  
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],[23] 280    
Ending balance $ 190 [5],[14],[19] $ 280 [2],[12],[23]  
Investment, Identifier [Axis]: Mini Melts of America, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.06% [14],[19],[22],[26] 10.74% [12],[23],[27],[35]  
Spread 6.25% [14],[19],[20],[22],[26] 6.25% [12],[23],[27],[28],[35]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[35] $ 375    
Ending balance $ 888 [5],[14],[19],[22],[26] $ 375 [2],[12],[23],[27],[35]  
Investment, Identifier [Axis]: Mini Melts of America, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.05% [14],[19],[22],[49] 10.77% [12],[23],[27],[51]  
Spread 6.25% [14],[19],[20],[22],[49] 6.25% [12],[23],[27],[28],[51]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[51] $ 858    
Ending balance $ 813 [5],[14],[19],[22],[49] $ 858 [2],[12],[23],[27],[51]  
Investment, Identifier [Axis]: Mini Melts of America, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 9.07% [14],[19],[22] 9.76% [12],[23],[27]  
Spread 5.25% [14],[19],[20],[22] 5.25% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 3,201    
Ending balance $ 3,012 [5],[14],[19],[22] $ 3,201 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Mini Melts of America, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 11.07% [14],[19],[22] 11.76% [12],[23],[27]  
Spread 7.25% [14],[19],[20],[22] 7.25% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 3,201    
Ending balance 3,000 [5],[14],[19],[22] $ 3,201 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Mission Critical Group | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19] $ 6,690    
Investment, Identifier [Axis]: Mission Critical Group | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread [14],[19],[20],[21],[22] 5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[21],[22] $ (55)    
Investment, Identifier [Axis]: Mission Critical Group | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 9.33%    
Spread [14],[19],[20],[22] 5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 4,100    
Investment, Identifier [Axis]: Mission Critical Group | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 9.23%    
Spread [14],[19],[20],[22] 5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 18,438    
Investment, Identifier [Axis]: MoneyThumb Acquisition, LLC | Preferred Member Units      
Schedule of Investments [Line Items]      
Total Rate 12.00% [14],[25] 12.00% [12],[24]  
PIK Rate 12.00% [14],[15],[25] 12.00% [12],[16],[24]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[24] $ 427    
Ending balance $ 530 [5],[14],[25] $ 427 [2],[12],[24]  
Investment, Identifier [Axis]: MoneyThumb Acquisition, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 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 1,891 [5],[14] $ 2,197 [2],[12]  
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 200 [5],[14],[34] 148 [2],[12],[18]  
Investment, Identifier [Axis]: MonitorUS Holding, LLC | Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[38],[39] 226    
Ending balance $ 204 [5],[14],[19],[40],[41] $ 226 [2],[12],[23],[38],[39]  
Investment, Identifier [Axis]: MonitorUS Holding, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.18% [14],[19],[22],[40],[41] 11.59% [12],[23],[27],[38],[39]  
Spread 6.25% [14],[19],[20],[22],[40],[41] 7.00% [12],[23],[27],[28],[38],[39]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[38],[39] $ 1,125    
Ending balance $ 1,272 [5],[14],[19],[22],[40],[41] $ 1,125 [2],[12],[23],[27],[38],[39]  
Investment, Identifier [Axis]: MonitorUS Holding, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.18% [14],[19],[22],[40],[41] 11.59% [12],[23],[27],[38],[39]  
Spread 6.25% [14],[19],[20],[22],[40],[41] 7.00% [12],[23],[27],[28],[38],[39]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[38],[39] $ 3,160    
Ending balance $ 3,544 [5],[14],[19],[22],[40],[41] $ 3,160 [2],[12],[23],[27],[38],[39]  
Investment, Identifier [Axis]: MonitorUS Holding, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 10.18% [14],[19],[22],[40],[41] 11.59% [12],[23],[27],[38],[39]  
Spread 6.25% [14],[19],[20],[22],[40],[41] 7.00% [12],[23],[27],[28],[38],[39]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[38],[39] $ 5,213    
Ending balance $ 5,164 [5],[14],[19],[22],[40],[41] $ 5,213 [2],[12],[23],[27],[38],[39]  
Investment, Identifier [Axis]: MonitorUS Holding, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22],[40],[41] 10.18%    
Spread [14],[19],[20],[22],[40],[41] 6.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22],[40],[41] $ 359    
Investment, Identifier [Axis]: MonitorUS Holding, LLC | Unsecured Debt      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[40],[41] 8.00%    
PIK Rate [14],[15],[19],[40],[41] 8.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[40],[41] $ 23    
Investment, Identifier [Axis]: MonitorUS Holding, LLC | Unsecured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[38],[39]   8.00%  
PIK Rate [12],[16],[23],[38],[39]   8.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[38],[39] 34    
Ending balance [2],[12],[23],[38],[39]   $ 34  
Investment, Identifier [Axis]: MonitorUS Holding, LLC | Unsecured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[38],[39]   8.00%  
PIK Rate [12],[16],[23],[38],[39]   8.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[38],[39] 15    
Ending balance [2],[12],[23],[38],[39]   $ 15  
Investment, Identifier [Axis]: MonitorUS Holding, LLC | Unsecured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[38],[39]   8.00%  
PIK Rate [12],[16],[23],[38],[39]   8.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[38],[39] 31    
Ending balance [2],[12],[23],[38],[39]   $ 31  
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC | Common Stock      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 5,953 0  
Amount of Unrealized Gain/(Loss) (5,910) (8)  
Amount of Interest, Fees or Dividends Credited to Income 1,951 950  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 6,590 [2],[9],[24] 6,598  
Gross Additions 5,951 0  
Gross Reductions 12,541 8  
Ending balance 0 6,590 [2],[9],[24] 6,598
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],[29] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance 0 $ 0 [2],[9],[29] 0
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [9]   10.00%  
Amount of Realized Gain/(Loss) 0 $ 0  
Amount of Unrealized Gain/(Loss) (4) 4  
Amount of Interest, Fees or Dividends Credited to Income 144 147  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,436 [2],[9] 1,436  
Gross Additions 4 0  
Gross Reductions 1,440 0  
Ending balance 0 1,436 [2],[9] 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)   860  
Amount of Interest, Fees or Dividends Credited to Income   234  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 3,890 [2],[9],[24] 0  
Gross Additions   3,890  
Gross Reductions   0  
Ending balance   3,890 [2],[9],[24] 0
Investment, Identifier [Axis]: Nello Industries Investco, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 58    
Amount of Unrealized Gain/(Loss) 2,171    
Amount of Interest, Fees or Dividends Credited to Income 547    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 3,890    
Gross Additions 2,229    
Gross Reductions 289    
Ending balance $ 5,830 [5],[10],[25] $ 3,890  
Investment, Identifier [Axis]: Nello Industries Investco, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate [10] 12.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[10] $ 8,018    
Investment, Identifier [Axis]: Nello Industries Investco, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 6.50% 6.50% [9],[27],[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 12 248  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance (12) [2],[9],[27],[29] 0  
Gross Additions 12 5,388  
Gross Reductions 0 5,400  
Ending balance $ 0 $ (12) [2],[9],[27],[29] 0
Investment, Identifier [Axis]: Nello Industries Investco, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.50% 13.50% [9]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 156 0  
Amount of Interest, Fees or Dividends Credited to Income 973 538  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 6,619 [2],[9] 0  
Gross Additions 1,399 6,619  
Gross Reductions 0 0  
Ending balance 8,018 6,619 [2],[9] 0
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) 240 1,380  
Amount of Interest, Fees or Dividends Credited to Income 36 244  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,970 [2],[9],[24] 1,590  
Gross Additions 240 1,380  
Gross Reductions 0 0  
Ending balance 3,210 [5],[10],[25] 2,970 [2],[9],[24] 1,590
Investment, Identifier [Axis]: NexRev 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 30  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[9] 0  
Gross Additions 0 844  
Gross Reductions 0 844  
Ending balance 0 $ 0 [2],[9] 0
Investment, Identifier [Axis]: NexRev LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [9]   9.00%  
Amount of Realized Gain/(Loss) 0 $ 0  
Amount of Unrealized Gain/(Loss) (3) 3  
Amount of Interest, Fees or Dividends Credited to Income 38 260  
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 [2],[9] 2,435
Investment, Identifier [Axis]: NinjaTrader, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread [12],[23],[27],[28],[29]   6.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] (3)    
Ending balance [2],[12],[23],[27],[29]   $ (3)  
Investment, Identifier [Axis]: NinjaTrader, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   11.24%  
Spread [12],[23],[27],[28]   6.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] 14,436    
Ending balance [2],[12],[23],[27]   $ 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 1,530 [5],[10] 1,500 [2],[9]  
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) 160 164  
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 160 580  
Gross Reductions 0 0  
Ending balance 3,050 2,890 2,310
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 3,050 [5],[10] 2,890 [2],[9]  
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) 30 29  
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 30 210  
Gross Reductions 0 0  
Ending balance $ 1,530 $ 1,500 1,290
Investment, Identifier [Axis]: NuStep, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.48% [10],[22],[46] 11.16% [9],[27]  
Spread 6.50% [10],[20],[22],[46] 6.50% [9],[27],[28]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 87 110  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 900 [2],[9],[27] 899  
Gross Additions 0 1  
Gross Reductions 650 0  
Ending balance $ 250 [5],[10],[22],[46] $ 900 [2],[9],[27] 899
Investment, Identifier [Axis]: NuStep, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.00% [10],[46] 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 561 566  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 4,610 [2],[9] 4,606  
Gross Additions 0 4  
Gross Reductions 0 0  
Ending balance $ 4,610 [5],[10],[46] $ 4,610 [2],[9] 4,606
Investment, Identifier [Axis]: Obra Capital, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 7.25% [14],[19],[20],[21],[22] 7.50% [12],[23],[27],[28],[29]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] $ (14)    
Ending balance $ (10) [5],[14],[19],[21],[22] $ (14) [2],[12],[23],[27],[29]  
Investment, Identifier [Axis]: Obra Capital, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.09% [14],[19],[22] 11.97% [12],[23],[27]  
Spread 7.25% [14],[19],[20],[22] 7.50% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 11,766    
Ending balance $ 11,859 [5],[14],[19],[22] $ 11,766 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Obra Capital, Inc. | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 11.09%    
Spread [14],[19],[20],[22] 7.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 1,349    
Investment, Identifier [Axis]: OnPoint Industrial Services, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.42% [14],[19],[22] 11.35% [12],[23],[27]  
Spread 5.75% [14],[19],[20],[22] 7.00% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 1,040    
Ending balance $ 1,039 [5],[14],[19],[22] $ 1,040 [2],[12],[23],[27]  
Investment, Identifier [Axis]: OnPoint Industrial Services, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.42% [14],[19],[22] 11.33% [12],[23],[27]  
Spread 5.75% [14],[19],[20],[22] 7.00% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 2,888    
Ending balance 2,888 [5],[14],[19],[22] $ 2,888 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Oneliance, LLC | Preferred Stock      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 170 358  
Amount of Interest, Fees or Dividends Credited to Income 35 3  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 640 [2],[9] 282  
Gross Additions 170 358  
Gross Reductions 0 0  
Ending balance 810 [5],[10],[25] $ 640 [2],[9] 282
Investment, Identifier [Axis]: Oneliance, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Spread   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 0 1,339  
Gross Additions   21  
Gross Reductions   1,360  
Ending balance   0 1,339
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 (900)  
Amount of Interest, Fees or Dividends Credited to Income 60 112  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 3,360 [2],[9],[24],[37] 4,260  
Gross Additions 0 0  
Gross Reductions 0 900  
Ending balance $ 3,360 [5],[10],[36] $ 3,360 [2],[9],[24],[37] 4,260
Investment, Identifier [Axis]: Orttech Holdings, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [10],[22] 14.98%    
Spread 11.00% [10],[20],[22] 11.00% [9],[27],[28],[29]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 2 (1)  
Amount of Interest, Fees or Dividends Credited to Income 2 1  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[9],[27],[29] 0  
Gross Additions 153 1  
Gross Reductions 0 1  
Ending balance $ 153 [5],[10],[22] $ 0 [2],[9],[27],[29] 0
Investment, Identifier [Axis]: Orttech Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 14.98% [10],[22] 15.66% [9],[27]  
Spread 11.00% [10],[20],[22] 11.00% [9],[27],[28]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (23) (23)  
Amount of Interest, Fees or Dividends Credited to Income 849 932  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 5,490 [2],[9],[27] 5,510  
Gross Additions 23 23  
Gross Reductions 323 43  
Ending balance 5,190 [5],[10],[22] 5,490 [2],[9],[27] 5,510
Investment, Identifier [Axis]: Other Amounts related to investments transferred toor from other1940 Act classification during the period      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 4,301    
Amount of Unrealized Gain/(Loss) (3,611)    
Amount of Interest, Fees or Dividends Credited to Income (45)    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance (7,914)    
Gross Additions 0    
Gross Reductions 0    
Ending balance 0 (7,914)  
Investment, Identifier [Axis]: Other Amounts related to investments transferred toor from other1940 Act classification during the period 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   5,022  
Amount of Unrealized Gain/(Loss)   153  
Amount of Interest, Fees or Dividends Credited to Income   (2,516)  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 (36,978)  
Gross Additions   0  
Gross Reductions   0  
Ending balance   0 (36,978)
Investment, Identifier [Axis]: OtherAmounts related toinvestments transferred toor from other1940 Act classificationduring the period | 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 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance 0 $ 0 0
Investment, Identifier [Axis]: PTL US Bidco, Inc | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27],[38],[39]   13.03%  
Spread [12],[23],[27],[28],[38],[39]   8.25%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[38],[39] 443    
Ending balance [2],[12],[23],[27],[38],[39]   $ 443  
Investment, Identifier [Axis]: PTL US Bidco, Inc | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27],[38],[39]   13.03%  
Spread [12],[23],[27],[28],[38],[39]   8.25%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[38],[39] 1,155    
Ending balance [2],[12],[23],[27],[38],[39]   $ 1,155  
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 0 [5],[14] $ 1,140 [2],[12]  
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) 520 1,455  
Amount of Interest, Fees or Dividends Credited to Income 446 530  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 4,590 [2],[9],[24] 3,135  
Gross Additions 520 1,455  
Gross Reductions 0 0  
Ending balance 5,110 [5],[10],[25] 4,590 [2],[9],[24] 3,135
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) (2) 8  
Amount of Interest, Fees or Dividends Credited to Income 4 5  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[9],[29] 105  
Gross Additions 2 10  
Gross Reductions 2 115  
Ending balance $ 0 [5],[10],[21] $ 0 [2],[9],[29] 105
Investment, Identifier [Axis]: Pinnacle TopCo, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.00% [10] 13.00% [9]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (40) 141  
Amount of Interest, Fees or Dividends Credited to Income 964 1,033  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 7,160 [2],[9] 7,472  
Gross Additions 40 188  
Gross Reductions 400 500  
Ending balance 6,800 [5],[10] 7,160 [2],[9] 7,472
Investment, Identifier [Axis]: Power System Solutions | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] 1,640    
Ending balance [2],[12],[23]   $ 1,640  
Investment, Identifier [Axis]: Power System Solutions | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread [12],[23],[27],[28],[29]   6.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] (27)    
Ending balance [2],[12],[23],[27],[29]   $ (27)  
Investment, Identifier [Axis]: Power System Solutions | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   10.86%  
Spread [12],[23],[27],[28]   6.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] 2,640    
Ending balance [2],[12],[23],[27]   $ 2,640  
Investment, Identifier [Axis]: Power System Solutions | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   10.90%  
Spread [12],[23],[27],[28]   6.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 7,859    
Ending balance [2],[12],[23],[27]   $ 7,859  
Investment, Identifier [Axis]: PrimeFlight Aviation Services | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.35% [14],[19],[22],[40] 10.58% [12],[23],[27]  
Spread 5.50% [14],[19],[20],[22],[40] 5.50% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 5,910    
Ending balance $ 5,850 [5],[14],[19],[22],[40] $ 5,910 [2],[12],[23],[27]  
Investment, Identifier [Axis]: PrimeFlight Aviation Services | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.17% [14],[19],[22],[40] 9.83% [12],[23],[27]  
Spread 5.50% [14],[19],[20],[22],[40] 5.50% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 564    
Ending balance $ 559 [5],[14],[19],[22],[40] $ 564 [2],[12],[23],[27]  
Investment, Identifier [Axis]: PrimeFlight Aviation Services | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 9.17% [14],[19],[22],[40] 9.83% [12],[23],[27]  
Spread 5.50% [14],[19],[20],[22],[40] 5.50% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 567    
Ending balance $ 561 [5],[14],[19],[22],[40] $ 567 [2],[12],[23],[27]  
Investment, Identifier [Axis]: PrimeFlight Aviation Services | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 8.92% [14],[19],[22],[40] 9.58% [12],[23],[27]  
Spread 5.25% [14],[19],[20],[22],[40] 5.25% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 644    
Ending balance $ 638 [5],[14],[19],[22],[40] $ 644 [2],[12],[23],[27]  
Investment, Identifier [Axis]: PrimeFlight Aviation Services | Secured Debt 5      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22],[40] 9.12%    
Spread [14],[19],[20],[22],[40] 5.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22],[40] $ 1,414    
Investment, Identifier [Axis]: PrimeFlight Aviation Services | Secured Debt 6      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22],[40] 9.09%    
Spread [14],[19],[20],[22],[40] 5.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22],[40] $ 1,327    
Investment, Identifier [Axis]: PrimeFlight Aviation Services | Secured Debt 7      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22],[40] 8.63%    
Spread [14],[19],[20],[22],[40] 4.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22],[40] $ 1,073    
Investment, Identifier [Axis]: Purge Rite, LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] 820    
Ending balance [2],[12],[23]   820  
Investment, Identifier [Axis]: Purge Rite, LLC | Preferred Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] 1,289    
Ending balance [2],[12],[23]   $ 1,289  
Investment, Identifier [Axis]: RA Outdoors LLC | Common Equity      
Schedule of Investments [Line Items]      
Spread [9],[23],[28],[38]   6.75%  
PIK Rate [9],[16],[23],[38]   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],[23],[38] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 0 [5],[10],[19] $ 0 [2],[9],[23],[38] 0
Investment, Identifier [Axis]: RA Outdoors LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.89% [10],[19],[22] 11.74% [9],[23],[27],[38]  
Spread 6.75% [10],[19],[20],[22] 6.75% [9],[23],[27],[28],[38]  
PIK Rate 10.89% [10],[15],[19],[22] 11.74% [9],[16],[23],[27],[38]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (151) (44)  
Amount of Interest, Fees or Dividends Credited to Income 152 65  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,215 [2],[9],[23],[27],[38] 745  
Gross Additions 116 519  
Gross Reductions 189 49  
Ending balance $ 1,142 [5],[10],[19],[22] $ 1,215 [2],[9],[23],[27],[38] 745
Investment, Identifier [Axis]: RA Outdoors LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [9],[23],[27],[38]   11.74%  
Spread 6.75% [10],[19],[20],[21],[22] 6.75% [9],[23],[27],[28],[38]  
PIK Rate [9],[16],[23],[27],[38]   11.74%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (460)  
Amount of Interest, Fees or Dividends Credited to Income   685  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 12,710 [2],[9],[23],[27],[38] 12,089  
Gross Additions   850  
Gross Reductions   229  
Ending balance $ 0 [5],[10],[19],[21],[22] 12,710 [2],[9],[23],[27],[38] 12,089
Investment, Identifier [Axis]: RA Outdoors LLC | Secured Debt 2.1      
Schedule of Investments [Line Items]      
Total Rate 10.89%    
Spread 6.75%    
PIK Rate 10.89%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (1,582)    
Amount of Interest, Fees or Dividends Credited to Income 1,599    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 12,710    
Gross Additions 1,215    
Gross Reductions 1,988    
Ending balance $ 11,937 12,710  
Investment, Identifier [Axis]: RA Outdoors LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [10],[19],[22] 10.89%    
Spread [10],[19],[20],[22] 6.75%    
PIK Rate [10],[15],[19],[22] 10.89%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[10],[19],[22] $ 11,937    
Investment, Identifier [Axis]: RA Outdoors LLC | Secured Debt 3.1      
Schedule of Investments [Line Items]      
Spread 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 $ 0 $ 0  
Investment, Identifier [Axis]: RA Outdoors LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Spread [10],[19],[20],[21],[22] 6.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[10],[19],[21],[22] $ 0    
Investment, Identifier [Axis]: Richardson Sales Solutions | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 8.86% [14],[19],[22],[26] 11.22% [12],[23],[27],[35]  
Spread 5.00% [14],[19],[20],[22],[26] 6.75% [12],[23],[27],[28],[35]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[35] $ 1,075    
Ending balance $ 340 [5],[14],[19],[22],[26] $ 1,075 [2],[12],[23],[27],[35]  
Investment, Identifier [Axis]: Richardson Sales Solutions | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 8.86% [14],[19],[22] 11.38% [12],[23],[27]  
Spread 5.00% [14],[19],[20],[22] 6.75% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 10,288    
Ending balance $ 10,023 [5],[14],[19],[22] $ 10,288 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Richardson Sales Solutions | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 8.93% [14],[19],[22] 11.43% [12],[23],[27]  
Spread 5.00% [14],[19],[20],[22] 6.75% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 5,065    
Ending balance 4,938 [5],[14],[19],[22] $ 5,065 [2],[12],[23],[27]  
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 [2],[9] 0
Investment, Identifier [Axis]: Robbins Bros. Jewelry, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
PIK Rate [9],[16],[29],[32]   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 6 1  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance (7) [2],[9],[29],[32] (6)  
Gross Additions 0 0  
Gross Reductions 5 1  
Ending balance $ (12) [5],[10],[17],[21] $ (7) [2],[9],[29],[32] (6)
Investment, Identifier [Axis]: Robbins Bros. Jewelry, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.50% [10],[17] 12.50% [9],[32]  
PIK Rate 10.00% [10],[15],[17] 10.00% [9],[16],[32]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 28 (1,663)  
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],[32] 3,421  
Gross Additions 0 0  
Gross Reductions 58 1,804  
Ending balance 1,559 [5],[10],[17] $ 1,617 [2],[9],[32] 3,421
Investment, Identifier [Axis]: Roof Opco, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread [12],[23],[27],[28],[29]   8.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] 0    
Ending balance $ 0 [5],[14],[19],[21] $ 0 [2],[12],[23],[27],[29]  
Investment, Identifier [Axis]: Roof Opco, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.00% [14],[19] 11.85% [12],[23],[27]  
Spread [12],[23],[27],[28]   7.00%  
PIK Rate [14],[15],[19] 10.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 3,840    
Ending balance $ 3,056 [5],[14],[19] $ 3,840 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Roof Opco, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 10.00% [14],[19] 13.85% [12],[23],[27]  
Spread [12],[23],[27],[28]   9.00%  
PIK Rate [14],[15],[19] 10.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 3,815    
Ending balance 2,970 [5],[14],[19] $ 3,815 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Royal Cup Inc. | Preferred Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19] $ 857    
Investment, Identifier [Axis]: Royal Cup Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread [14],[19],[20],[21],[22] 5.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[21],[22] $ (51)    
Investment, Identifier [Axis]: Royal Cup Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Spread [14],[19],[20],[21],[22] 5.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[21],[22] $ (19)    
Investment, Identifier [Axis]: Royal Cup Inc. | Secured Debt 3      
Schedule of Investments [Line Items]      
Spread [14],[19],[20],[21],[22] 5.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[21],[22] $ (82)    
Investment, Identifier [Axis]: Royal Cup Inc. | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 8.98%    
Spread [14],[19],[20],[22] 5.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 11,826    
Investment, Identifier [Axis]: Rug Doctor, LLC. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.17% [14],[19],[22] 12.52% [12],[23],[27]  
Spread 5.50% [14],[19],[20],[22] 8.00% [12],[23],[27],[28]  
PIK Rate [12],[16],[23],[27]   2.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 6,542    
Ending balance $ 4,134 [5],[14],[19],[22] $ 6,542 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Rug Doctor, LLC. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.17% [14],[19],[22] 12.52% [12],[23],[27]  
Spread 5.50% [14],[19],[20],[22] 8.00% [12],[23],[27],[28]  
PIK Rate [12],[16],[23],[27]   2.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 8,277    
Ending balance 7,590 [5],[14],[19],[22] $ 8,277 [2],[12],[23],[27]  
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) 1,180 (1,840)  
Amount of Interest, Fees or Dividends Credited to Income 157 541  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 4,550 [2],[9],[24] 6,390  
Gross Additions 1,180 0  
Gross Reductions 0 1,840  
Ending balance $ 5,730 [5],[10],[25] $ 4,550 [2],[9],[24] 6,390
Investment, Identifier [Axis]: SI East, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.80% [10] 11.75% [9]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (2) 0  
Amount of Interest, Fees or Dividends Credited to Income 98 88  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 750 [2],[9] 375  
Gross Additions 2 750  
Gross Reductions 2 375  
Ending balance $ 750 [5],[10] $ 750 [2],[9] 375
Investment, Identifier [Axis]: SI East, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.85% [10],[52] 12.79% [9],[53]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 9 21  
Amount of Interest, Fees or Dividends Credited to Income 2,927 1,948  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 22,554 [2],[9],[53] 0  
Gross Additions 0 22,554  
Gross Reductions 271 0  
Ending balance 22,283 [5],[10],[52] 22,554 [2],[9],[53] 0
Investment, Identifier [Axis]: SI East, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   (161)  
Amount of Interest, Fees or Dividends Credited to Income   947  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 18,179  
Gross Additions   0  
Gross Reductions   18,179  
Ending balance   0 18,179
Investment, Identifier [Axis]: SPAU Holdings, LLC | Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] 190    
Ending balance $ 200 [5],[14],[19] $ 190 [2],[12],[23]  
Investment, Identifier [Axis]: SPAU Holdings, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 7.00% [14],[19],[20],[21],[22],[26] 7.50% [12],[23],[27],[28],[29]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] $ 0    
Ending balance $ 0 [5],[14],[19],[21],[22],[26] $ 0 [2],[12],[23],[27],[29]  
Investment, Identifier [Axis]: SPAU Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.82% [14],[19],[22] 11.98% [12],[23],[27]  
Spread 7.00% [14],[19],[20],[22] 7.50% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 4,875    
Ending balance 4,825 [5],[14],[19],[22] $ 4,875 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Slick Innovations, LLC | Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[24] 630    
Ending balance $ 560 [5],[14],[25] $ 630 [2],[12],[24]  
Investment, Identifier [Axis]: Slick Innovations, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 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 6,170 [5],[14] $ 4,080 [2],[12]  
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],[23] 62    
Ending balance $ 71 [5],[14],[19] $ 62 [2],[12],[23]  
Investment, Identifier [Axis]: South Coast Terminals Holdings, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 5.25% [14],[19],[20],[21],[22] 5.25% [12],[23],[27],[28],[29]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] $ 0    
Ending balance $ 0 [5],[14],[19],[21],[22] $ 0 [2],[12],[23],[27],[29]  
Investment, Identifier [Axis]: South Coast Terminals Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.07% [14],[19],[22] 9.71% [12],[23],[27]  
Spread 5.25% [14],[19],[20],[22] 5.25% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 4,388    
Ending balance $ 33,214 [5],[14],[19],[22] $ 4,388 [2],[12],[23],[27]  
Investment, Identifier [Axis]: South Coast Terminals Holdings, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 9.07%    
Spread [14],[19],[20],[22] 5.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 6,525    
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],[23] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 0 [5],[10],[19] $ 0 [2],[9],[23] 0
Investment, Identifier [Axis]: Student Resource Center, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 8.50% [10],[19] 8.50% [9],[23]  
PIK Rate 8.50% [10],[15],[19] 8.50% [9],[16],[23]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[9],[23] $ 227    
Ending balance $ 866 [5],[10],[19] $ 227 [2],[9],[23]  
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 $ 0  
Amount of Unrealized Gain/(Loss) (228) (1,717)  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,826 3,543  
Gross Additions 0 0  
Gross Reductions 228 1,717  
Ending balance $ 1,598 $ 1,826 3,543
Investment, Identifier [Axis]: Student Resource Center, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 8.50% [10],[17],[19] 8.50% [9],[23],[32]  
PIK Rate 8.50% [10],[15],[17],[19] 8.50% [9],[16],[23],[32]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[9],[23],[32] $ 1,826    
Ending balance 1,598 [5],[10],[17],[19] $ 1,826 [2],[9],[23],[32]  
Investment, Identifier [Axis]: Student Resource Center, LLC | Secured Debt 2.1      
Schedule of Investments [Line Items]      
Total Rate   8.50%  
PIK Rate   8.50%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   5  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 227 0  
Gross Additions   227  
Gross Reductions   0  
Ending balance   227 0
Investment, Identifier [Axis]: Student Resource Center, LLC | Secured Debt 2.2      
Schedule of Investments [Line Items]      
Total Rate 8.50%    
PIK Rate 8.50%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 620    
Amount of Interest, Fees or Dividends Credited to Income 19    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 227    
Gross Additions 639    
Gross Reductions 0    
Ending balance $ 866 $ 227  
Investment, Identifier [Axis]: TEC Services, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 5.50% [14],[19],[20],[21],[22] 5.75% [12],[23],[27],[28],[29]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] $ (7)    
Ending balance $ (6) [5],[14],[19],[21],[22] $ (7) [2],[12],[23],[27],[29]  
Investment, Identifier [Axis]: TEC Services, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Spread 5.50% [14],[19],[20],[21],[22] 5.75% [12],[23],[27],[28],[29]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] $ (5)    
Ending balance $ (4) [5],[14],[19],[21],[22] $ (5) [2],[12],[23],[27],[29]  
Investment, Identifier [Axis]: TEC Services, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 9.27% [14],[19],[22] 10.13% [12],[23]  
Spread 5.50% [14],[19],[20],[22] 5.75% [12],[23],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] $ 2,299    
Ending balance 2,302 [5],[14],[19],[22] $ 2,299 [2],[12],[23]  
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 [5],[10] 0 [2],[9] 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 [5],[10] 0 [2],[9] 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 [5],[10] $ 0 [2],[9] 0
Investment, Identifier [Axis]: Tedder Industries, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 12.00% [10],[17],[46] 12.00% [9],[32],[33]  
PIK Rate 12.00% [10],[15],[17],[46] 12.00% [9],[16],[32],[33]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 69 (15)  
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],[32],[33] 432  
Gross Additions 0 0  
Gross Reductions 171 20  
Ending balance $ 241 [5],[10],[17],[46] $ 412 [2],[9],[32],[33] 432
Investment, Identifier [Axis]: Tedder Industries, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.00% [10],[17],[46] 12.00% [9],[32],[33]  
PIK Rate 12.00% [10],[15],[17],[46] 12.00% [9],[16],[32],[33]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (194) (2,626)  
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],[32],[33] 3,565  
Gross Additions 0 0  
Gross Reductions 194 2,664  
Ending balance 707 [5],[10],[17],[46] 901 [2],[9],[32],[33] 3,565
Investment, Identifier [Axis]: Tex Tech Tennis, LLC | Preferred Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[37] 2,290    
Ending balance 2,900 [5],[14],[19],[36] 2,290 [2],[12],[23],[37]  
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],[24] 72    
Ending balance 78 [5],[14] 72 [2],[12],[24]  
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],[24] 1,600    
Ending balance 1,600 [5],[14],[19],[25] $ 1,600 [2],[12],[24]  
Investment, Identifier [Axis]: The Affiliati Network, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [12]   10.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12] 98    
Ending balance [2],[12]   $ 98  
Investment, Identifier [Axis]: The Affiliati Network, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [12]   10.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12] $ 1,274    
Ending balance [2],[12]   $ 1,274  
Investment, Identifier [Axis]: Titan Meter Midco Corp. | Preferred Equity      
Schedule of Investments [Line Items]      
Total Rate 8.00% [14],[19] 8.00% [12],[23]  
PIK Rate 8.00% [14],[15],[19] 8.00% [12],[16],[23]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] $ 540    
Ending balance $ 590 [5],[14],[19] $ 540 [2],[12],[23]  
Investment, Identifier [Axis]: Titan Meter Midco Corp. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 10.17%    
Spread 6.50% [14],[19],[20],[22] 6.50% [12],[23],[27],[28],[29]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] $ (40)    
Ending balance $ 554 [5],[14],[19],[22] $ (40) [2],[12],[23],[27],[29]  
Investment, Identifier [Axis]: Titan Meter Midco Corp. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.17% [14],[19],[22] 10.83% [12],[23],[27]  
Spread 6.50% [14],[19],[20],[22] 6.50% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 13,049    
Ending balance $ 12,917 [5],[14],[19],[22] $ 13,049 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Titan Meter Midco Corp. | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 10.17%    
Spread [14],[19],[20],[22] 6.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 1,653    
Investment, Identifier [Axis]: Titan Meter Midco Corp. | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 10.17%    
Spread [14],[19],[20],[22] 6.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 1,870    
Investment, Identifier [Axis]: Trantech Radiator Topco, 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 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 174    
Gross Reductions 0    
Ending balance 174 [5],[10],[36] 0  
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) 1,590 (1,040)  
Amount of Interest, Fees or Dividends Credited to Income 222 29  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,140 [2],[9],[24] 3,180  
Gross Additions 1,590 0  
Gross Reductions 0 1,040  
Ending balance 3,730 [5],[10],[25] 2,140 [2],[9],[24] 3,180
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)   (1)  
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],[29] 0  
Gross Additions   0  
Gross Reductions   1  
Ending balance 0 [5],[10],[21] (1) [2],[9],[29] 0
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Secured Debt 1.1      
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 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% [9]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 18 (6)  
Amount of Interest, Fees or Dividends Credited to Income 283 274  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,962 [2],[9] 1,980  
Gross Additions 288 0  
Gross Reductions 0 18  
Ending balance $ 2,250 [5],[10] 1,962 [2],[9] 1,980
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [10] 9.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 2    
Amount of Interest, Fees or Dividends Credited to Income 5    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 510    
Gross Reductions 0    
Ending balance $ 510 [5],[10] $ 0  
Investment, Identifier [Axis]: U.S. TelePacific Corp. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 12.32% [13],[14],[17],[22] 11.90% [11],[12],[27],[32]  
Spread 8.15% [13],[14],[17],[20],[22] 7.40% [11],[12],[27],[28],[32]  
PIK Rate 7.00% [13],[14],[15],[17],[22] 6.00% [11],[12],[16],[27],[32]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[12],[27],[32] $ 2,686    
Ending balance 2,747 [5],[13],[14],[17],[22] $ 2,686 [2],[11],[12],[27],[32]  
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],[32] 0    
Ending balance 0 [5],[13],[14],[17] 0 [2],[11],[12],[32]  
Investment, Identifier [Axis]: UBM AcquireCo LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14] 2,000    
Investment, Identifier [Axis]: UBM AcquireCo LLC | Secured Debt 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[21] $ (10)    
Investment, Identifier [Axis]: UBM AcquireCo LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [14] 10.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14] $ 10,595    
Investment, Identifier [Axis]: UPS Intermediate, LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] 412    
Ending balance $ 420 [5],[14],[19] $ 412 [2],[12],[23]  
Investment, Identifier [Axis]: UPS Intermediate, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 9.97% [14],[19],[22] 10.36% [12],[23],[27]  
Spread 6.25% [14],[19],[20],[22] 6.00% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 19,294    
Ending balance 19,168 [5],[14],[19],[22] $ 19,294 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Urgent DSO LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Total Rate [9],[24]   9.00%  
PIK Rate [9],[16],[24]   9.00%  
Amount of Realized Gain/(Loss) 0 $ 0  
Amount of Unrealized Gain/(Loss) (65) 0  
Amount of Interest, Fees or Dividends Credited to Income 74 80  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,080 [2],[9],[24] 0  
Gross Additions 74 1,080  
Gross Reductions 65 0  
Ending balance $ 1,089 [5],[10],[25] $ 1,080 [2],[9],[24] 0
Investment, Identifier [Axis]: Urgent DSO LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 13.50% [10] 13.50% [9]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 10 0  
Amount of Interest, Fees or Dividends Credited to Income 314 280  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,145 [2],[9] 0  
Gross Additions 23 2,145  
Gross Reductions 0 0  
Ending balance $ 2,168 [5],[10] $ 2,145 [2],[9] 0
Investment, Identifier [Axis]: UserZoom Technologies, Inc. | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 11.63% [14],[19],[22] 12.75% [12],[23],[27]  
Spread 7.50% [14],[19],[20],[22] 7.50% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 3,000    
Ending balance 3,000 [5],[14],[19],[22] $ 3,000 [2],[12],[23],[27]  
Investment, Identifier [Axis]: VORTEQ Coil Finishers, LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[24] 1,950    
Ending balance 2,670 [5],[14],[19],[25] 1,950 [2],[12],[23],[24]  
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 25 100  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 3,060 [2],[9],[24],[37] 3,060  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 3,060 [5],[10],[25],[36] $ 3,060 [2],[9],[24],[37] 3,060
Investment, Identifier [Axis]: VVS Holdco LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 6.00% [10],[20],[21],[22] 6.00% [9],[27],[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 4 4  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[9],[27],[29] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 0 [5],[10],[21],[22] $ 0 [2],[9],[27],[29] 0
Investment, Identifier [Axis]: VVS Holdco LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.50% [10] 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 764 843  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 6,366 [2],[9] 6,926  
Gross Additions 41 50  
Gross Reductions 440 610  
Ending balance 5,967 [5],[10] 6,366 [2],[9] 6,926
Investment, Identifier [Axis]: Victory Energy Operations, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 151 0  
Amount of Interest, Fees or Dividends Credited to Income 86 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 3,644 [2],[9] 0  
Gross Additions 151 4,198  
Gross Reductions 35 554  
Ending balance $ 3,760 [5],[10] 3,644 [2],[9] 0
Investment, Identifier [Axis]: Victory Energy Operations, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [10] 13.00%    
Amount of Realized Gain/(Loss) $ 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 13 1  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance (5) [2],[9],[29] 0  
Gross Additions 409 0  
Gross Reductions 277 5  
Ending balance $ 127 [5],[10] $ (5) [2],[9],[29] 0
Investment, Identifier [Axis]: Victory Energy Operations, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.00% [10] 13.00% [9]  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 1,068 263  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 7,529 [2],[9] 0  
Gross Additions 46 7,529  
Gross Reductions 0 0  
Ending balance 7,575 [5],[10] 7,529 [2],[9] 0
Investment, Identifier [Axis]: Vistar Media, Inc. | Preferred Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] $ 4,676    
Ending balance [2],[12],[23]   $ 4,676  
Investment, Identifier [Axis]: Vitesse Systems | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.98% [14],[19],[26] 11.55% [12],[23]  
Spread 7.00% [14],[19],[20],[26] 7.00% [12],[23],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] $ 1,705    
Ending balance $ 2,273 [5],[14],[19],[26] $ 1,705 [2],[12],[23]  
Investment, Identifier [Axis]: Vitesse Systems | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.93% [14],[19],[22] 11.47% [12],[23],[27]  
Spread 7.00% [14],[19],[20],[22] 7.00% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 12,375    
Ending balance 12,250 [5],[14],[19],[22] $ 12,375 [2],[12],[23],[27]  
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 [5],[8] 0 [2],[7] 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    
Ending balance 1,249 [5],[8] 3,004 [2],[7]  
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 5 13  
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
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    
Ending balance 0 [5],[8] 0 [2],[7]  
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) (834) 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 1,764 2,001  
Ending balance 1,249 3,004 3,110
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 [5],[8] $ 0 [2],[7] 0
Investment, Identifier [Axis]: Volusion, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 10.00% [8],[46] 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 91 91  
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 [5],[8],[46] 900 [2],[7] $ 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],[23] 1,510    
Ending balance [2],[12],[23]   $ 1,510  
Investment, Identifier [Axis]: Wall Street Prep, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread [12],[23],[27],[28],[29]   7.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27],[29] (3)    
Ending balance [2],[12],[23],[27],[29]   $ (3)  
Investment, Identifier [Axis]: Wall Street Prep, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   11.74%  
Spread [12],[23],[27],[28]   7.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] 2,199    
Ending balance [2],[12],[23],[27]   $ 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],[19] $ 210    
Investment, Identifier [Axis]: Wash & Wax Systems LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 9.28%    
Spread [14],[19],[20],[22] 5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 44    
Investment, Identifier [Axis]: Wash & Wax Systems LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 9.34%    
Spread [14],[19],[20],[22] 5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 1,029    
Investment, Identifier [Axis]: Wash & Wax Systems LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [14],[19] 12.00%    
PIK Rate [14],[15],[19] 12.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19] $ 730    
Investment, Identifier [Axis]: Watterson Brands, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 12.00% [14],[17],[19] 12.00% [12],[23]  
PIK Rate 4.00% [14],[15],[17],[19] 4.00% [12],[16],[23]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] $ 292    
Ending balance $ 218 [5],[14],[17],[19] $ 292 [2],[12],[23]  
Investment, Identifier [Axis]: Watterson Brands, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.00% [14],[17],[19] 12.00% [12],[23]  
PIK Rate 4.00% [14],[15],[17],[19] 4.00% [12],[16],[23]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] $ 50    
Ending balance $ 37 [5],[14],[17],[19] $ 50 [2],[12],[23]  
Investment, Identifier [Axis]: Watterson Brands, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 12.00% [14],[17],[19] 12.00% [12],[23]  
PIK Rate 4.00% [14],[15],[17],[19] 4.00% [12],[16],[23]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] $ 2,076    
Ending balance $ 1,543 [5],[14],[17],[19] $ 2,076 [2],[12],[23]  
Investment, Identifier [Axis]: Watterson Brands, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 12.00% [14],[17],[19] 12.00% [12],[23]  
PIK Rate 4.00% [14],[15],[17],[19] 4.00% [12],[16],[23]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23] $ 1,874    
Ending balance 1,392 [5],[14],[17],[19] $ 1,874 [2],[12],[23]  
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],[23],[24] 640    
Ending balance [2],[12],[23],[24]   $ 640  
Investment, Identifier [Axis]: West Star Aviation Acquisition, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   9.47%  
Spread [12],[23],[27],[28]   5.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] 658    
Ending balance [2],[12],[23],[27]   $ 658  
Investment, Identifier [Axis]: West Star Aviation Acquisition, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   9.60%  
Spread [12],[23],[27],[28]   5.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] 2,917    
Ending balance [2],[12],[23],[27]   $ 2,917  
Investment, Identifier [Axis]: West Star Aviation Acquisition, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   9.60%  
Spread [12],[23],[27],[28]   5.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 1,452    
Ending balance [2],[12],[23],[27]   $ 1,452  
Investment, Identifier [Axis]: Winter Services LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.49% [14],[19],[22],[26] 12.81% [12],[23],[27]  
Spread 7.50% [14],[19],[20],[22],[26] 8.00% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 2,672    
Ending balance $ 5,000 [5],[14],[19],[22],[26] $ 2,672 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Winter Services LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.75% [14],[19],[22] 12.85% [12],[23],[27]  
Spread 7.50% [14],[19],[20],[22] 8.00% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 2,276    
Ending balance $ 2,343 [5],[14],[19],[22] $ 2,276 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Winter Services LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 10.75% [14],[19],[22] 11.85% [12],[23],[27]  
Spread 6.50% [14],[19],[20],[22] 7.00% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 8,794    
Ending balance $ 9,050 [5],[14],[19],[22] $ 8,794 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Winter Services LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 12.75% [14],[19],[22] 13.85% [12],[23],[27]  
Spread 8.50% [14],[19],[20],[22] 9.00% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 8,794    
Ending balance 9,050 [5],[14],[19],[22] $ 8,794 [2],[12],[23],[27]  
Investment, Identifier [Axis]: World Micro Holdings, LLC | Preferred Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[24] 530    
Ending balance $ 530 [5],[14],[25] $ 530 [2],[12],[24]  
Investment, Identifier [Axis]: World Micro Holdings, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 12.00% [14] 13.00% [12]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12] $ 1,468    
Ending balance $ 1,354 [5],[14] $ 1,468 [2],[12]  
Investment, Identifier [Axis]: Xenon Arc, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.54% [14],[19],[22] 9.70% [12],[23],[27]  
Spread 5.75% [14],[19],[20],[22] 5.25% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 1,176    
Ending balance $ 1,164 [5],[14],[19],[22] $ 1,176 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Xenon Arc, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.72% [14],[19],[22] 9.98% [12],[23],[27]  
Spread 5.75% [14],[19],[20],[22] 5.25% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 2,328    
Ending balance $ 2,304 [5],[14],[19],[22] $ 2,328 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Xenon Arc, Inc. | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [14],[19],[22] 9.52%    
Spread [14],[19],[20],[22] 5.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[14],[19],[22] $ 604    
Investment, Identifier [Axis]: YS Garments, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 11.48% [13],[14],[22] 12.25% [11],[12],[27]  
Spread 7.50% [13],[14],[20],[22] 7.50% [11],[12],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[12],[27] $ 4,661    
Ending balance $ 4,167 [5],[13],[14],[22] $ 4,661 [2],[11],[12],[27]  
Investment, Identifier [Axis]: ZRG Partners, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.75% [14],[19],[22] 12.50% [12],[23],[27]  
Spread 5.00% [14],[19],[20],[22] 5.00% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 86    
Ending balance $ 821 [5],[14],[19],[22] $ 86 [2],[12],[23],[27]  
Investment, Identifier [Axis]: ZRG Partners, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.69% [14],[19],[22],[49] 10.74% [12],[23],[27]  
Spread 6.00% [14],[19],[20],[22],[49] 6.00% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 517    
Ending balance $ 1,465 [5],[14],[19],[22],[49] $ 517 [2],[12],[23],[27]  
Investment, Identifier [Axis]: ZRG Partners, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 9.60% [14],[19],[22] 10.28% [12],[23],[27]  
Spread 6.00% [14],[19],[20],[22] 6.00% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 817    
Ending balance $ 809 [5],[14],[19],[22] $ 817 [2],[12],[23],[27]  
Investment, Identifier [Axis]: ZRG Partners, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 9.73% [14],[19],[22] 10.66% [12],[23],[27]  
Spread 6.00% [14],[19],[20],[22] 6.00% [12],[23],[27],[28]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 5,852    
Ending balance 5,786 [5],[14],[19],[22] $ 5,852 [2],[12],[23],[27]  
Investment, Identifier [Axis]: Zips Car Wash, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   11.91%  
Spread [12],[23],[27],[28]   7.25%  
PIK Rate [12],[16],[23],[27]   11.91%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] 2,025    
Ending balance [2],[12],[23],[27]   $ 2,025  
Investment, Identifier [Axis]: Zips Car Wash, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [12],[23],[27]   11.91%  
Spread [12],[23],[27],[28]   7.25%  
PIK Rate [12],[16],[23],[27]   11.91%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[12],[23],[27] $ 508    
Ending balance [2],[12],[23],[27]   $ 508  
[1] All portfolio company headquarters are based in the U.S., 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 U.S., 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 Fund’s 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 December 31, 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] 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.
[20] 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 December 31, 2025, SOFR based contracts in the portfolio had Adjustments ranging from 0.10% to 0.26%.
[21] The position is unfunded and no interest income is being earned as of December 31, 2025. The position may earn a nominal unused facility fee on committed amounts.
[22] 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 1.31%.
[23] Private Loan portfolio investment. See Note C—Fair Value Hierarchy for Investments—Portfolio Composition for a description of Private Loan portfolio investments.
[24] Income producing through dividends or distributions.
[25] Income producing through dividends or distributions.
[26] 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, 2025.
[27] 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%.
[28] 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%.
[29] 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.
[30] Index based floating interest rate is subject to contractual maximum base rate of 3.00%.
[31] Index based floating interest rate is subject to contractual maximum base rate of 3.00%.
[32] Non-accrual and non-income producing debt investment.
[33] Maturity date is under on-going negotiations with the portfolio company and other lenders, if applicable.
[34] Warrants are presented in equivalent shares/units with a strike price of $0.01 per share/unit.
[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 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.
[39] Portfolio company headquarters are located outside of the U.S.
[40] Investment is not a qualifying asset as defined under Section 55(a) of the 1940 Act (as defined below). Qualifying assets must represent at least 70% of total assets at the time of acquisition of any additional non-qualifying assets.
[41] Portfolio company headquarters are located outside of the U.S.
[42] Investment is not unitized. Presentation is made in percent of fully diluted ownership unless otherwise indicated.
[43] Other Portfolio investment. See Note C—Fair Value Hierarchy for Investments—Portfolio Composition for a description of Other Portfolio investments.
[44] Investment is not unitized. Presentation is made in percent of fully diluted ownership unless otherwise indicated.
[45] Other Portfolio (as defined below) investment. See Note C—Fair Value Hierarchy for Investments—Portfolio Composition for a description of Other Portfolio investments.
[46] Maturity date is under on-going negotiations with the portfolio company and other lenders, if applicable.
[47] Index based floating interest rate is subject to contractual maximum base rate of 4.00%.
[48] Index based floating interest rate is subject to contractual maximum base rate of 4.00%.
[49] 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, 2025.
[50] Investment is accruing income at the fixed cash rate of 2.50% as of December 31, 2025
[51] 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.
[52] 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 11.80% per the credit agreement and the Consolidated Schedule of Investments above reflects such higher rate.
[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 11.75% per the credit agreement and the Consolidated Schedule of Investments above reflects such higher rate.