Quarterly report pursuant to Section 13 or 15(d)

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

v3.23.1
Consolidated Schedule of Investments In and Advances to Affiliates (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) $ 3,432 $ 253  
Amount of Unrealized Gain/(Loss) (4,139) 3,731  
Control investments      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 631 0  
Amount of Unrealized Gain/(Loss) (686) 177  
Amount of Interest, Fees or Dividends Credited to Income 809 1,001  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 50,303 46,583  
Gross Additions 1,189 347  
Gross Reductions 1,586 0  
Ending balance 49,906 46,930  
Control investments | Southwest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance $ 49,318 $ 46,220  
Net assets, percentage 8.10% 7.50%  
Control investments | West      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance $ 588 $ 710  
Net assets, percentage 0.10% 0.10%  
Affiliate investments      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) $ 1,637 $ 446  
Amount of Unrealized Gain/(Loss) 1,321 77  
Amount of Interest, Fees or Dividends Credited to Income 7,894 5,206  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 277,000 234,158  
Gross Additions 18,474 10,930  
Gross Reductions 24,633 4,088  
Ending balance 270,841 241,000  
Affiliate investments | Midwest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance $ 94,403 83,390  
Net assets, percentage 15.50%   13.50%
Affiliate investments | Northeast      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance $ 20,461 $ 21,902  
Net assets, percentage 3.40% 3.60%  
Affiliate investments | Southeast      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance $ 38,664 $ 31,907  
Net assets, percentage 6.40% 5.20%  
Affiliate investments | Southwest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance $ 79,994 $ 66,266  
Net assets, percentage 13.20% 10.70%  
Affiliate investments | West      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance $ 37,319 $ 37,535  
Net assets, percentage 6.10% 6.10%  
Investment, Identifier [Axis]: AAC Holdings, Inc., Secured Debt      
Schedule of Investments [Line Items]      
Total Rate [1]     18.00%
PIK Rate [1]     18.00%
Investment, Identifier [Axis]: AAC Holdings, Inc., Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [2] 18.00%    
Investment, Identifier [Axis]: AAC Holdings, Inc., Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [2] 18.00%    
PIK Rate [2] 18.00%    
Investment, Identifier [Axis]: AB Centers Acquisition Corporation, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [3],[4] 13.00%    
Spread 5.00% [3],[4]   6.00% [5],[6]
Investment, Identifier [Axis]: AB Centers Acquisition Corporation, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.80% [3],[4],[7],[8]   10.20% [5],[6]
Spread 6.00% [3],[4],[7],[8]   6.00% [5],[6]
Investment, Identifier [Axis]: AB Centers Acquisition Corporation, Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 10.79% [3],[4],[7]   10.58% [5],[6]
Spread 6.00% [3],[4],[7]   6.00% [5],[6]
Investment, Identifier [Axis]: ADS Tactical, Inc., Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 10.59% [2],[4]   10.14% [1],[6]
Spread 5.75% [2],[4]   5.75% [1],[6]
Investment, Identifier [Axis]: AFG Capital Group, LLC, Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 160  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,350 1,930  
Gross Additions 0 160  
Gross Reductions 0 0  
Ending balance $ 2,350 $ 2,090  
Investment, Identifier [Axis]: AFG Capital Group, LLC, Secured Debt      
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   1  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   36  
Gross Additions   0  
Gross Reductions   22  
Ending balance   14  
Investment, Identifier [Axis]: AMEREQUIP LLC., Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 7.40% [3],[4],[7],[9]   7.40% [5],[6]
Investment, Identifier [Axis]: AMEREQUIP LLC., Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.10% [3],[4],[7]   11.72% [5],[6]
Spread 7.40% [3],[4],[7]   7.40% [5],[6]
Investment, Identifier [Axis]: ASK (Analytical Systems Keco Holdings, LLC), Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   (140)  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   1,220  
Gross Additions   0  
Gross Reductions   140  
Ending balance   $ 1,080  
Investment, Identifier [Axis]: ASK (Analytical Systems Keco Holdings, LLC), Preferred Member Units 1      
Schedule of Investments [Line Items]      
Total Rate 14.13%    
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    
Investment, Identifier [Axis]: ASK (Analytical Systems Keco Holdings, LLC), Preferred Member Units 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 20    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 880    
Gross Additions 20    
Gross Reductions 0    
Ending balance $ 900    
Investment, Identifier [Axis]: ASK (Analytical Systems Keco Holdings, LLC), Secured Debt      
Schedule of Investments [Line Items]      
Total Rate   12.00%  
Spread   10.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   42  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   1,178  
Gross Additions   7  
Gross Reductions   17  
Ending balance   1,168  
Investment, Identifier [Axis]: ASK (Analytical Systems Keco Holdings, LLC), Secured Debt 1      
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 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance (2)    
Gross Additions 0    
Gross Reductions 0    
Ending balance $ (2)    
Investment, Identifier [Axis]: ASK (Analytical Systems Keco Holdings, LLC), Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 14.75%    
Spread 10.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 47    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,135    
Gross Additions 5    
Gross Reductions 18    
Ending balance 1,122    
Investment, Identifier [Axis]: ASK (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 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 0 $ 0  
Investment, Identifier [Axis]: ATS Operating, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [3],[4],[7] 11.39%    
Spread 6.50% [3],[4],[7]   5.50% [5],[6]
Investment, Identifier [Axis]: ATS Operating, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.09% [3],[4],[7]   9.32% [5],[6]
Spread 5.50% [3],[4],[7]   5.50% [5],[6]
Investment, Identifier [Axis]: ATS Operating, LLC, Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 12.09% [3],[4],[7]   11.32% [5],[6]
Spread 7.50% [3],[4],[7]   7.50% [5],[6]
Investment, Identifier [Axis]: ATX Networks Corp., Common Stock      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) $ 3,178    
Amount of Unrealized Gain/(Loss) (3,290)    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 3,290    
Gross Additions 3,178    
Gross Reductions 6,468    
Ending balance $ 0    
Investment, Identifier [Axis]: ATX Networks Corp., Secured Debt      
Schedule of Investments [Line Items]      
Total Rate   8.50% 12.23% [1],[6]
Spread 7.50% 7.50% 7.50% [1],[6]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (102) 235  
Amount of Interest, Fees or Dividends Credited to Income 682 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 6,368 7,121  
Gross Additions 545 235  
Gross Reductions 6,913 96  
Ending balance $ 0 $ 7,260  
Investment, Identifier [Axis]: ATX Networks Corp., Unsecured Debt      
Schedule of Investments [Line Items]      
Total Rate   10.00% 10.00% [1]
PIK Rate 10.00% 10.00% 10.00% [1]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (276) 84  
Amount of Interest, Fees or Dividends Credited to Income 1,135 74  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,614 1,977  
Gross Additions 1,135 159  
Gross Reductions 3,749 0  
Ending balance $ 0 2,136  
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [3],[4],[7] 12.52%    
Spread 7.75% [3],[4],[7]   7.25% [5],[6]
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.61% [3],[4],[7]   12.17% [5],[6]
Spread 7.75% [3],[4],[7]   7.25% [5],[6]
Investment, Identifier [Axis]: Acumera, Inc., Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 14.13% [3]   13.88% [5],[6]
Spread 9.50% [3]   9.50% [5],[6]
Investment, Identifier [Axis]: Acumera, Inc., Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 14.13% [3]   13.57% [5],[6]
Spread 9.50% [3]   9.00% [5],[6]
Investment, Identifier [Axis]: Acumera, Inc., Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [3] 14.13%    
Spread [3] 9.50%    
Investment, Identifier [Axis]: Adams Publishing Group, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.00% [3],[4],[10]   10.00% [5],[6],[11]
Spread 6.50% [3],[4],[10]   6.00% [5],[6],[11]
Investment, Identifier [Axis]: Adams Publishing Group, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.00% [3],[4],[12]   10.00% [5],[6],[11]
Spread 7.50% [3],[4],[12]   7.50% [5],[6],[11]
Investment, Identifier [Axis]: American Health Staffing Group, Inc., Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 6.00% [3],[4],[9]   6.00% [5],[6]
Investment, Identifier [Axis]: American Health Staffing Group, Inc., Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.12% [3],[4]   11.12% [5],[6]
Spread 6.00% [3],[4]   6.00% [5],[6]
Investment, Identifier [Axis]: American Nuts, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 12.49% [3],[4],[7]   10.46% [5],[6]
Spread 6.75% [3],[4],[7]   6.75% [5],[6]
PIK Rate [3],[4],[7] 1.00%    
Investment, Identifier [Axis]: American Nuts, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 14.49% [3],[4],[7]   12.46% [5],[6]
Spread 8.75% [3],[4],[7]   8.75% [5],[6]
PIK Rate [3],[4],[7] 1.00%    
Investment, Identifier [Axis]: American Teleconferencing Services, Ltd., Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 7.50% [2],[13]   7.50% [1],[14]
Spread 6.50% [2],[13]   6.50% [1],[14]
Investment, Identifier [Axis]: American Teleconferencing Services, Ltd., Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 7.50% [2],[4],[13]   7.50% [1],[6],[14]
Spread 6.50% [2],[4],[13]   6.50% [1],[6],[14]
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Preferred Member Units 1      
Schedule of Investments [Line Items]      
Total Rate 14.13%   14.13%
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 10.00% [4],[9]   10.00% [6]
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 14.75% [4]   14.13% [6]
Spread 10.00% [4]   10.00% [6]
Investment, Identifier [Axis]: ArborWorks, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 14.83% [3],[4],[7]   13.41% [5],[6]
Spread 7.00% [3],[4],[7]   9.00% [5],[6]
PIK Rate [3],[4],[7] 3.00%    
Investment, Identifier [Axis]: ArborWorks, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 14.83% [3],[4],[7]   13.56% [5],[6]
Spread 7.00% [3],[4],[7]   9.00% [5],[6]
PIK Rate [3],[4],[7] 3.00%    
Investment, Identifier [Axis]: Archer Systems, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 6.00% [3],[4],[7],[9]   6.50% [5],[6]
Investment, Identifier [Axis]: Archer Systems, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.72% [3],[4],[7]   10.92% [5],[6]
Spread 6.00% [3],[4],[7]   6.50% [5],[6]
Investment, Identifier [Axis]: BBB Tank Services, LLC, Preferred Stock (non-voting)      
Schedule of Investments [Line Items]      
Total Rate 15.00%   15.00%
Investment, Identifier [Axis]: BBB Tank Services, LLC, Unsecured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 15.66% [4],[15]   15.12% [6],[16]
Spread 11.00% [4],[15]   11.00% [6],[16]
Investment, Identifier [Axis]: BBB Tank Services, LLC, Unsecured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 15.66% [4],[15]   15.12% [6],[16]
Spread 11.00% [4],[15]   11.00% [6],[16]
Investment, Identifier [Axis]: Barfly Ventures, LLC, Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (93)    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,107    
Gross Additions 0    
Gross Reductions 94    
Ending balance 1,013    
Investment, Identifier [Axis]: Barfly Ventures, LLC, Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   40  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   643  
Gross Additions   40  
Gross Reductions   0  
Ending balance   683  
Investment, Identifier [Axis]: Batjer TopCo, LLC, Member Units      
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   453  
Gross Reductions   0  
Ending balance   $ 453  
Investment, Identifier [Axis]: Batjer TopCo, LLC, Preferred Stock      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 225    
Amount of Interest, Fees or Dividends Credited to Income 19    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 455    
Gross Additions 225    
Gross Reductions 0    
Ending balance 680    
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate   11.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   10  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   1,201  
Gross Reductions   0  
Ending balance   1,201  
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance (1)    
Gross Additions 0    
Gross Reductions 0    
Ending balance $ (1)    
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.00%   11.00%
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 36    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,205    
Gross Additions 2    
Gross Reductions 50    
Ending balance $ 1,157    
Investment, Identifier [Axis]: Berry Aviation, Inc., Preferred Member Units 1      
Schedule of Investments [Line Items]      
Total Rate 8.00% [3],[17],[18]   8.00% [5],[19],[20]
PIK Rate 8.00% [3],[17],[18]   8.00% [5],[19],[20]
Investment, Identifier [Axis]: Berry Aviation, Inc., Preferred Member Units 2      
Schedule of Investments [Line Items]      
PIK Rate 16.00% [3],[9],[17],[18]   16.00% [5],[19],[20]
Investment, Identifier [Axis]: Berry Aviation, Inc., Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 12.00% [3]   12.00% [5]
PIK Rate 1.50% [3]   1.50% [5]
Investment, Identifier [Axis]: Bettercloud, Inc., Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 7.00% [3],[4],[7],[9]   1.00% [5],[6]
PIK Rate 6.00% [3],[4],[7],[9]   6.00% [5],[6]
Investment, Identifier [Axis]: Bettercloud, Inc., Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.89% [3],[4],[7]   11.40% [5],[6]
Spread 7.00% [3],[4],[7]   1.00% [5],[6]
PIK Rate 6.00% [3],[4],[7]   6.00% [5],[6]
Investment, Identifier [Axis]: Bluestem Brands, Inc., Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [2],[4] 15.50%    
Spread 7.50% [2],[4]   8.50% [1],[6]
PIK Rate [2],[4] 14.50%    
Investment, Identifier [Axis]: Bluestem Brands, Inc., Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.07% [2],[4]   12.94% [1],[6]
Spread 8.50% [2],[4]   8.50% [1],[6]
PIK Rate [2],[4] 12.07%    
Investment, Identifier [Axis]: Boccella Precast Products LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 10.00%   10.00%
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) $ 0 0  
Amount of Unrealized Gain/(Loss) (130) 10  
Amount of Interest, Fees or Dividends Credited to Income 8 66  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,770 1,930  
Gross Additions 0 10  
Gross Reductions 130 0  
Ending balance $ 1,640 $ 1,940  
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 14.66% [4] 11.00% 14.12% [6]
Spread 10.00% [4] 10.00% 10.00% [6]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 53 57  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,491 2,005  
Gross Additions 0 2  
Gross Reductions 31 31  
Ending balance $ 1,460 1,976  
Investment, Identifier [Axis]: Buca C, LLC, Preferred Member Units      
Schedule of Investments [Line Items]      
Total Rate 6.00%   6.00%
PIK Rate 6.00%   6.00%
Investment, Identifier [Axis]: Buca C, LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 12.00%   9.00%
Investment, Identifier [Axis]: Burning Glass Intermediate Holding Company, Inc., Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [3],[4] 9.83%    
Spread 5.00% [3],[4]   5.00% [5],[6]
Investment, Identifier [Axis]: Burning Glass Intermediate Holding Company, Inc., Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.63% [3],[4]   8.91% [5],[6]
Spread 5.00% [3],[4]   5.00% [5],[6]
Investment, Identifier [Axis]: Cadence Aerospace LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate [5],[6],[21]     11.99%
Spread [5],[6],[21]     8.50%
PIK Rate [5],[6],[21]     0.01%
Investment, Identifier [Axis]: Cadence Aerospace LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [3],[4] 13.14%    
Spread [3],[4] 6.50%    
PIK Rate [3],[4] 2.00%    
Investment, Identifier [Axis]: Cadence Aerospace LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [3],[4] 13.14%    
Spread [3],[4] 6.50%    
PIK Rate [3],[4] 2.00%    
Investment, Identifier [Axis]: Cadence Aerospace LLC, Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [3],[4] 13.33%    
Spread [3],[4] 6.50%    
PIK Rate [3],[4] 2.00%    
Investment, Identifier [Axis]: Cadence Aerospace LLC, Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate [3],[4] 13.23%    
Spread [3],[4] 6.50%    
PIK Rate [3],[4] 2.00%    
Investment, Identifier [Axis]: Cadence Aerospace LLC, Secured Debt 5      
Schedule of Investments [Line Items]      
Total Rate [3],[4] 13.33%    
Spread [3],[4] 6.50%    
PIK Rate [3],[4] 2.00%    
Investment, Identifier [Axis]: Camin Cargo Control, Inc., Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 11.34% [2],[4],[7]   10.88% [1],[6]
Spread 6.50% [2],[4],[7]   6.50% [1],[6]
Investment, Identifier [Axis]: Career Team Holdings, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 6.00% [4],[9]   6.00% [6]
Investment, Identifier [Axis]: Career Team Holdings, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.50%   12.50%
Investment, Identifier [Axis]: CaseWorthy, Inc., Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 6.00% [3],[4],[9]   6.00% [5],[6]
Investment, Identifier [Axis]: CaseWorthy, Inc., Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.73% [3],[4]   10.73% [5],[6]
Spread 6.00% [3],[4]   6.00% [5],[6]
Investment, Identifier [Axis]: CaseWorthy, Inc., Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 10.73% [3],[4]   10.48% [5],[6]
Spread 6.00% [3],[4]   5.75% [5],[6]
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) 150 0  
Amount of Interest, Fees or Dividends Credited to Income 8 8  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,170 1,460  
Gross Additions 150 0  
Gross Reductions 0 0  
Ending balance $ 2,320 $ 1,460  
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate   12.00%  
Spread   10.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   73  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   2,216  
Gross Additions   3  
Gross Reductions   38  
Ending balance   2,181  
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 9.00% [4],[9]   9.00% [6]
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    
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.75% [4]   13.13% [6]
Spread 9.00% [4]   9.00% [6]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 130    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 3,731    
Gross Additions 2    
Gross Reductions 0    
Ending balance 3,733    
Investment, Identifier [Axis]: Chamberlin Holding LLC, Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   (27)  
Amount of Interest, Fees or Dividends Credited to Income   78  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   6,415  
Gross Additions   0  
Gross Reductions   27  
Ending balance   $ 6,388  
Investment, Identifier [Axis]: Chamberlin Holding LLC, Member Units 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) (30)    
Amount of Interest, Fees or Dividends Credited to Income 71    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 5,728    
Gross Additions 0    
Gross Reductions 28    
Ending balance 5,700    
Investment, Identifier [Axis]: Chamberlin Holding LLC, Member Units 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 30    
Amount of Interest, Fees or Dividends Credited to Income 6    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 678    
Gross Additions 30    
Gross Reductions 0    
Ending balance $ 708    
Investment, Identifier [Axis]: Chamberlin Holding LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate   9.00%  
Spread   8.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (11)  
Amount of Interest, Fees or Dividends Credited to Income   110  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   4,454  
Gross Additions   11  
Gross Reductions   45  
Ending balance   4,420  
Investment, Identifier [Axis]: Chamberlin Holding LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 6.00% [4],[7]   6.00% [6]
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    
Investment, Identifier [Axis]: Chamberlin Holding LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.86% [4],[7]   12.13% [6]
Spread 8.00% [4],[7]   8.00% [6]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (3)    
Amount of Interest, Fees or Dividends Credited to Income 137    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 4,236    
Gross Additions 3    
Gross Reductions 3    
Ending balance $ 4,236    
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.06% [3],[4],[7],[22]   10.72% [5],[6],[23]
Spread 6.25% [3],[4],[7],[22]   6.25% [5],[6],[23]
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.08% [3],[4],[7],[22]   10.71% [5],[6],[24]
Spread 6.25% [3],[4],[7],[22]   6.25% [5],[6],[24]
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC, Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [3],[4],[7] 11.14%    
Spread [3],[4],[7] 6.25%    
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) 60 20  
Amount of Interest, Fees or Dividends Credited to Income 49 52  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 3,330 3,500  
Gross Additions 60 20  
Gross Reductions 0 0  
Ending balance 3,390 $ 3,520  
Investment, Identifier [Axis]: Charps, LLC, Unsecured Debt      
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   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   0  
Gross Reductions   0  
Ending balance   0  
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   20  
Amount of Interest, Fees or Dividends Credited to Income   87  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   2,693  
Gross Additions   20  
Gross Reductions   1  
Ending balance   $ 2,712  
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Member Units 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) (270)    
Amount of Interest, Fees or Dividends Credited to Income 13    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,060    
Gross Additions 0    
Gross Reductions 270    
Ending balance 1,790    
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) 55    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 152    
Gross Additions 55    
Gross Reductions 0    
Ending balance $ 207    
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 13.79% [4],[7] 10.50% 13.23% [6]
Spread 9.00% [4],[7] 9.50% 9.00% [6]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 69  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 2,620  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 0 $ 2,620  
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.00% 10.00% 10.00%
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   7  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   268  
Gross Additions   0  
Gross Reductions   2  
Ending balance   266  
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 2.1      
Schedule of Investments [Line Items]      
Total Rate 13.79%    
Spread 9.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 89    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,620    
Gross Additions 0    
Gross Reductions 120    
Ending balance $ 2,500    
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 3      
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 7    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 260    
Gross Additions 0    
Gross Reductions 2    
Ending balance $ 258    
Investment, Identifier [Axis]: Clarius BIGS, LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 15.00% [3],[13],[15]   15.00% [5],[14],[16]
PIK Rate 15.00% [3],[13],[15]   15.00% [5],[14],[16]
Investment, Identifier [Axis]: Classic H&G Holdings, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.88% [4]   9.75% [6]
Spread 6.00% [4]   6.00% [6]
Investment, Identifier [Axis]: Classic H&G Holdings, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 8.00%   8.00%
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) 240 0  
Amount of Interest, Fees or Dividends Credited to Income 7 172  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 14,550 11,910  
Gross Additions 240 0  
Gross Reductions 0 0  
Ending balance $ 14,790 $ 11,910  
Investment, Identifier [Axis]: Cody Pools, Inc., Secured Debt      
Schedule of Investments [Line Items]      
Total Rate   12.25%  
Spread   10.50%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   4  
Amount of Interest, Fees or Dividends Credited to Income   234  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   7,181  
Gross Additions   649  
Gross Reductions   640  
Ending balance   7,190  
Investment, Identifier [Axis]: Cody Pools, Inc., Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 15.50% [4]   15.38% [6]
Spread 10.50% [4]   10.50% [6]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 2    
Amount of Interest, Fees or Dividends Credited to Income 11    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 273    
Gross Additions 3    
Gross Reductions 80    
Ending balance $ 196    
Investment, Identifier [Axis]: Cody Pools, Inc., Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 15.50% [4]   15.38% [6]
Spread 10.50% [4]   10.50% [6]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (7)    
Amount of Interest, Fees or Dividends Credited to Income 268    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 6,882    
Gross Additions 7    
Gross Reductions 83    
Ending balance 6,806    
Investment, Identifier [Axis]: Colonial Electric Company LLC, Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) (240) 0  
Amount of Interest, Fees or Dividends Credited to Income (318) 93  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,290 2,280  
Gross Additions 0 0  
Gross Reductions 240 0  
Ending balance 2,050 $ 2,280  
Investment, Identifier [Axis]: Colonial Electric Company LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate   12.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   192  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   6,007  
Gross Additions   10  
Gross Reductions   79  
Ending balance   5,938  
Investment, Identifier [Axis]: Colonial Electric Company 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 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 0    
Gross Reductions 0    
Ending balance $ 0    
Investment, Identifier [Axis]: Colonial Electric Company LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.00%   12.00%
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 181    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 5,729    
Gross Additions 9    
Gross Reductions 79    
Ending balance $ 5,659    
Investment, Identifier [Axis]: Computer Data Source, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 12.34% [3],[4],[25]   12.56% [5],[6],[26]
Spread 7.50% [3],[4],[25]   8.00% [5],[6],[26]
Investment, Identifier [Axis]: Computer Data Source, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.35% [3],[4]   12.56% [5],[6]
Spread 7.50% [3],[4]   8.00% [5],[6]
Investment, Identifier [Axis]: Copper Trail Energy Fund I, LP - CTMH, LP Interests (CTMH, LP)      
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   710  
Gross Additions   0  
Gross Reductions   0  
Ending balance   710  
Investment, Identifier [Axis]: Copper Trail Fund Investments, LP Interests (CTMH, LP)      
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 588    
Gross Additions 0    
Gross Reductions 0    
Ending balance $ 588    
Investment, Identifier [Axis]: DMA Industries, LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 12.00%   12.00%
Investment, Identifier [Axis]: DTE Enterprises, LLC, Class A Preferred Member Units      
Schedule of Investments [Line Items]      
Total Rate 8.00% [3]   8.00% [5]
PIK Rate 8.00% [3]   8.00% [5]
Investment, Identifier [Axis]: DTE Enterprises, LLC, Class AA Preferred Member Units (non-voting)      
Schedule of Investments [Line Items]      
Total Rate 10.00% [3],[17]   10.00% [5],[19]
PIK Rate 10.00% [3],[17]   10.00% [5],[19]
Investment, Identifier [Axis]: DTE Enterprises, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 7.50% [3],[4],[9]   7.50% [5],[6]
Investment, Identifier [Axis]: DTE Enterprises, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.44% [3],[4]   12.24% [5],[6]
Spread 7.50% [3],[4]   7.50% [5],[6]
Investment, Identifier [Axis]: Dalton US Inc., Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 12.33% [3],[4],[7],[27]   11.90% [5],[6]
Spread 7.50% [3],[4],[7],[27]   8.00% [5],[6]
Investment, Identifier [Axis]: Dalton US Inc., Secured Debt 2      
Schedule of Investments [Line Items]      
Spread 7.50% [3],[4],[7],[9]   8.00% [5],[6]
Investment, Identifier [Axis]: Dalton US Inc., Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 12.26% [3],[4],[7]   12.56% [5],[6]
Spread 7.50% [3],[4],[7]   8.00% [5],[6]
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) 0 10  
Amount of Interest, Fees or Dividends Credited to Income 0 3  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 300 290  
Gross Additions 0 10  
Gross Reductions 0 0  
Ending balance $ 300 $ 300  
Investment, Identifier [Axis]: Datacom, LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate   7.50%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   25  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   852  
Gross Additions   6  
Gross Reductions   7  
Ending balance   851  
Investment, Identifier [Axis]: Datacom, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 7.50%   7.50%
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 25    
Gross Additions 25    
Gross Reductions 0    
Ending balance $ 50    
Investment, Identifier [Axis]: Datacom, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.00%   7.50%
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 30    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 865    
Gross Additions 6    
Gross Reductions 7    
Ending balance 864    
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 13 13  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,459 2,459  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 2,459 $ 2,459  
Investment, Identifier [Axis]: Digital Products Holdings LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 14.75% [4] 11.00% 14.13% [6]
Spread 10.00% [4] 10.00% 10.00% [6]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 144 120  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 3,878 4,186  
Gross Additions 5 6  
Gross Reductions 82 83  
Ending balance 3,801 4,109  
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) (130) 1,020  
Amount of Interest, Fees or Dividends Credited to Income 43 86  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 5,558 4,590  
Gross Additions 0 1,020  
Gross Reductions 128 0  
Ending balance 5,430 $ 5,610  
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc., Secured Debt      
Schedule of Investments [Line Items]      
Total Rate   12.00%  
Spread   11.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   1  
Amount of Interest, Fees or Dividends Credited to Income   150  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   4,698  
Gross Additions   14  
Gross Reductions   75  
Ending balance   4,637  
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc., Secured Debt 1      
Schedule of Investments [Line Items]      
Spread [6]     11.00%
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    
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc., Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 14.00%   15.13% [6]
Spread [6]     11.00%
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (4)    
Amount of Interest, Fees or Dividends Credited to Income 189    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 5,352    
Gross Additions 4    
Gross Reductions 84    
Ending balance $ 5,272    
Investment, Identifier [Axis]: Dynamic Communities, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.18% [3],[4],[7]   9.18% [5],[6]
Spread 4.50% [3],[4],[7]   4.50% [5],[6]
PIK Rate 9.18% [3],[4],[7]   9.18% [5],[6]
Investment, Identifier [Axis]: Dynamic Communities, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.18% [3],[4],[7]   11.18% [5],[6]
Spread 6.50% [3],[4],[7]   6.50% [5],[6]
PIK Rate 11.18% [3],[4],[7]   11.18% [5],[6]
Investment, Identifier [Axis]: EPIC Y-Grade Services, LP, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 10.96% [2],[4]   10.70% [1],[6]
Spread 6.00% [2],[4]   6.00% [1],[6]
Investment, Identifier [Axis]: Elgin AcquireCo, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 6.00% [4],[7],[9]   6.00% [6]
Investment, Identifier [Axis]: Elgin AcquireCo, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.00%   12.00%
Investment, Identifier [Axis]: Elgin AcquireCo, LLC, Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 9.00%   9.00%
Investment, Identifier [Axis]: Emerald Technologies Acquisition Co, Inc., Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 10.97% [2],[4],[7]   10.67% [1],[6]
Spread 6.25% [2],[4],[7]   6.25% [1],[6]
Investment, Identifier [Axis]: Engineering Research & Consulting, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.43% [3],[4],[7]   11.68% [5],[6]
Spread 6.50% [3],[4],[7]   6.50% [5],[6]
Investment, Identifier [Axis]: Engineering Research & Consulting, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.43% [3],[4],[7]   10.92% [5],[6]
Spread 6.50% [3],[4],[7]   6.50% [5],[6]
Investment, Identifier [Axis]: Event Holdco, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.73% [3],[4],[7],[18]   10.67% [5],[6],[20]
Spread 7.00% [3],[4],[7],[18]   7.00% [5],[6],[20]
Investment, Identifier [Axis]: Event Holdco, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.73% [3],[4],[7],[18]   10.67% [5],[6],[20]
Spread 7.00% [3],[4],[7],[18]   7.00% [5],[6],[20]
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) 900 0  
Amount of Interest, Fees or Dividends Credited to Income 134 70  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 4,400 2,600  
Gross Additions 900 0  
Gross Reductions 0 0  
Ending balance $ 5,300 $ 2,600  
Investment, Identifier [Axis]: Flame King Holdings, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.25% [4] 12.00% 10.75% [6]
Spread 6.50% [4] 11.00% 6.50% [6]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (1) 0  
Amount of Interest, Fees or Dividends Credited to Income 54 167  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,900 5,145  
Gross Additions 1 8  
Gross Reductions 1 0  
Ending balance $ 1,900 $ 5,153  
Investment, Identifier [Axis]: Flame King Holdings, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.75% [4] 7.50% 13.25% [6]
Spread 9.00% [4] 6.50% 9.00% [6]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (8) 0  
Amount of Interest, Fees or Dividends Credited to Income 188 35  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 5,300 1,581  
Gross Additions 8 301  
Gross Reductions 8 0  
Ending balance $ 5,300 1,882  
Investment, Identifier [Axis]: Flip Electronics LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 12.55% [3],[4],[7]   11.21% [5],[6]
Spread 7.50% [3],[4],[7]   7.50% [5],[6]
Investment, Identifier [Axis]: Flip Electronics LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.55% [3],[4],[7]   12.19% [5],[6]
Spread 7.50% [3],[4],[7]   7.50% [5],[6]
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) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 134 88  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 5,848 7,231  
Gross Additions 0 0  
Gross Reductions 536 0  
Ending balance 5,312 7,231  
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) 110 0  
Amount of Interest, Fees or Dividends Credited to Income 10 63  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,790 1,750  
Gross Additions 110 0  
Gross Reductions 0 0  
Ending balance $ 1,900 $ 1,750  
Investment, Identifier [Axis]: GFG Group, LLC., Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 9.00% 12.00% 9.00%
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (4) (5)  
Amount of Interest, Fees or Dividends Credited to Income 68 99  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,836 3,136  
Gross Additions 4 5  
Gross Reductions 4 5  
Ending balance 2,836 3,136  
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) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 21 600  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 21,890 22,750  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 21,890 $ 22,750  
Investment, Identifier [Axis]: GRT Rubber Technologies LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate   8.23%  
Spread   8.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (12)  
Amount of Interest, Fees or Dividends Credited to Income   401  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   19,152  
Gross Additions   1  
Gross Reductions   0  
Ending balance   19,153  
Investment, Identifier [Axis]: GRT Rubber Technologies LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.66%   10.12%
Spread 6.00%   6.00%
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 1    
Amount of Interest, Fees or Dividends Credited to Income 13    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 330    
Gross Additions 145    
Gross Reductions 0    
Ending balance $ 475    
Investment, Identifier [Axis]: GRT Rubber Technologies LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.66%   12.12%
Spread 8.00%   8.00%
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (12)    
Amount of Interest, Fees or Dividends Credited to Income 634    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 19,943    
Gross Additions 13    
Gross Reductions 12    
Ending balance 19,944    
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) 2,117 (1,151)  
Amount of Interest, Fees or Dividends Credited to Income 393 45  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 12,720 12,430  
Gross Additions 2,120 0  
Gross Reductions 0 1,151  
Ending balance $ 14,840 $ 11,279  
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate   10.50%  
Spread   8.50%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (1)  
Amount of Interest, Fees or Dividends Credited to Income   130  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   5,400  
Gross Additions   1  
Gross Reductions   1  
Ending balance   $ 5,400  
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 8.50% [4],[7],[9],[28]   8.50% [6]
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    
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.50% [4],[7],[28]   11.50% [6]
Spread 8.50% [4],[7],[28]   8.50% [6]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (17)    
Amount of Interest, Fees or Dividends Credited to Income 474    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 16,020    
Gross Additions 17    
Gross Reductions 217    
Ending balance 15,820    
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC, Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 0    
Gross Reductions 0    
Ending balance 0    
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC, Preferred 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 950    
Gross Additions 0    
Gross Reductions 0    
Ending balance $ 950    
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate   10.50%  
Spread 9.50% [4],[9] 9.50% 9.50% [6]
PIK Rate   5.25%  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 1  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 64  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 0 $ 64  
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.50% 12.50% 12.50%
PIK Rate   6.25%  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 (430)  
Amount of Interest, Fees or Dividends Credited to Income 19 53  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 571 2,429  
Gross Additions 0 0  
Gross Reductions 0 429  
Ending balance $ 571 2,000  
Investment, Identifier [Axis]: HDC/HW Intermediate Holdings, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 14.34% [3],[4],[7]   14.34% [5],[6]
Spread 9.50% [3],[4],[7]   9.50% [5],[6]
PIK Rate 14.34% [3],[4],[7]   2.00% [5],[6]
Investment, Identifier [Axis]: HDC/HW Intermediate Holdings, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 14.34% [3],[4],[7]   14.34% [5],[6]
Spread 9.50% [3],[4],[7]   9.50% [5],[6]
PIK Rate 14.34% [3],[4],[7]   2.00% [5],[6]
Investment, Identifier [Axis]: HEADLANDS OP-CO LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 6.50% [3],[4],[7],[9]   6.50% [5],[6]
Investment, Identifier [Axis]: HEADLANDS OP-CO LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Spread 6.50% [3],[4],[7],[9]   6.50% [5],[6]
Investment, Identifier [Axis]: HEADLANDS OP-CO LLC, Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 11.12% [3],[4],[7]   10.62% [5],[6]
Spread 6.50% [3],[4],[7]   6.50% [5],[6]
Investment, Identifier [Axis]: HPEP 3, L.P., LP Interests (HPEP 3, L.P.)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) $ 0 446  
Amount of Unrealized Gain/(Loss) 113 (280)  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 4,331 4,712  
Gross Additions 113 0  
Gross Reductions 508 280  
Ending balance 3,936 4,432  
Investment, Identifier [Axis]: Harris Preston Fund Investments, LP Interests (2717 HPP-MS, L.P.)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   0  
Gross Reductions   0  
Ending balance   0  
Investment, Identifier [Axis]: Harris Preston Fund Investments, LP Interests (2717 MH, L.P.)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 631 0  
Amount of Unrealized Gain/(Loss) (675) 189  
Amount of Interest, Fees or Dividends Credited to Income 141 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 7,552 3,971  
Gross Additions 1,031 346  
Gross Reductions 1,574 0  
Ending balance $ 7,009 4,317  
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.75% [4]   10.13% [6]
Spread 6.00% [4]   6.00% [6]
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.00%   9.00%
Investment, Identifier [Axis]: Hybrid Promotions, LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 13.10% [3],[4],[7]   12.07% [5]
Spread 8.25% [3],[4],[7]   8.25% [5]
Investment, Identifier [Axis]: IG Parent Corporation, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [1],[6],[29]     10.17%
Spread 5.75% [2],[4],[7],[9]   5.75% [1],[6],[29]
Investment, Identifier [Axis]: IG Parent Corporation, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.59% [2],[4],[7]   10.17% [1],[6]
Spread 5.75% [2],[4],[7]   5.75% [1],[6]
Investment, Identifier [Axis]: INW Manufacturing, LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 10.48% [4],[30]   10.48% [1],[6]
Spread 5.75% [4],[30]   5.75% [1],[6]
Investment, Identifier [Axis]: Implus Footcare, LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 13.99% [3],[4],[7]   13.98% [5],[6]
Spread 7.75% [3],[4],[7]   7.75% [5],[6]
PIK Rate 1.50% [3],[4],[7]   1.50% [5],[6]
Investment, Identifier [Axis]: Independent Pet Partners Intermediate Holdings, LLC, Preferred Stock (non-voting) 1      
Schedule of Investments [Line Items]      
Total Rate 6.00% [3]   6.00% [5]
PIK Rate 6.00% [3]   6.00% [5]
Investment, Identifier [Axis]: Independent Pet Partners Intermediate Holdings, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 6.00% [3],[13]   6.00% [5],[14]
PIK Rate 6.00% [3],[13]   6.00% [5],[14]
Investment, Identifier [Axis]: Independent Pet Partners Intermediate Holdings, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 14.95% [3]   14.42% [5]
Spread 10.00% [3]   10.00% [5]
PIK Rate 14.95% [3]   14.42% [5]
Investment, Identifier [Axis]: Independent Pet Partners Intermediate Holdings, LLC, Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [3] 14.66%    
Spread [3] 10.00%    
PIK Rate [3] 14.66%    
Investment, Identifier [Axis]: Industrial Services Acquisition, LLC, Preferred Member Units 1      
Schedule of Investments [Line Items]      
Total Rate 10.00% [3],[17],[18]   10.00% [5],[19],[20]
PIK Rate 10.00% [3],[17],[18]   10.00% [5],[19],[20]
Investment, Identifier [Axis]: Industrial Services Acquisition, LLC, Preferred Member Units 2      
Schedule of Investments [Line Items]      
Total Rate 20.00% [3],[17],[18]   20.00% [5],[19],[20]
PIK Rate 20.00% [3],[17],[18]   20.00% [5],[19],[20]
Investment, Identifier [Axis]: Industrial Services Acquisition, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.50% [3],[4]   11.50% [5],[6]
Spread 6.75% [3],[4]   6.75% [5],[6]
Investment, Identifier [Axis]: Industrial Services Acquisition, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.50% [3],[4]   11.50% [5],[6]
Spread 6.75% [3],[4]   6.75% [5],[6]
Investment, Identifier [Axis]: Infinity X1 Holdings, LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 13.00%    
Investment, Identifier [Axis]: Infolinks Media Buyco, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 5.50% [3],[4],[9]   5.50% [5],[6]
Investment, Identifier [Axis]: Infolinks Media Buyco, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.23% [3],[4]   10.23% [5],[6]
Spread 5.50% [3],[4]   5.50% [5],[6]
Investment, Identifier [Axis]: Interface Security Systems, L.L.C, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [5],[31]     14.22%
Spread [5],[31]     10.00%
Investment, Identifier [Axis]: Interface Security Systems, L.L.C, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 14.76% [3]   12.07% [5],[6],[14]
Spread 10.00% [3]   7.00% [5],[6],[14]
PIK Rate [5],[6],[14]     1.00%
Investment, Identifier [Axis]: Interface Security Systems, L.L.C, Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [3],[4],[13] 11.63%    
Spread [3],[4],[13] 7.00%    
PIK Rate [3],[4],[13] 11.63%    
Investment, Identifier [Axis]: Intermedia Holdings, Inc., Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 10.84% [2],[4]   10.38% [1],[6]
Spread 6.00% [2],[4]   6.00% [1],[6]
Investment, Identifier [Axis]: Invincible Boat Company, LLC., Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.32% [3],[4],[32]   10.14% [5],[6]
Spread 6.50% [3],[4],[32]   6.50% [5],[6]
Investment, Identifier [Axis]: Invincible Boat Company, LLC., Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.23% [3],[4]   10.17% [5],[6]
Spread 6.50% [3],[4]   6.50% [5],[6]
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 13.50%   12.50%
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.50%   12.50%
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 13.50%   12.50%
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 13.50%   12.50%
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Secured Debt 5      
Schedule of Investments [Line Items]      
Total Rate 13.50%    
Investment, Identifier [Axis]: Isagenix International, LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 9.93% [2],[4],[13]   9.93% [1],[6],[14]
Spread 7.75% [2],[4],[13]   7.75% [1],[6],[14]
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 6.00% [3],[4],[9]   6.00% [5],[6]
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.73% [3],[4]   10.73% [5],[6]
Spread 6.00% [3],[4]   6.00% [5],[6]
Investment, Identifier [Axis]: Jackmont Hospitality, Inc., Preferred Equity      
Schedule of Investments [Line Items]      
Total Rate [5],[19]     12.00%
PIK Rate [5],[19]     12.00%
Investment, Identifier [Axis]: Jackmont Hospitality, Inc., Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 12.23% [3],[4]   12.23% [5],[6]
Spread 7.50% [3],[4]   7.50% [5],[6]
Investment, Identifier [Axis]: Jackmont Hospitality, Inc., Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.23% [3],[4]   12.23% [5],[6]
Spread 7.50% [3],[4]   7.50% [5],[6]
Investment, Identifier [Axis]: Joerns Healthcare, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 23.04% [2],[7]   18.00% [1]
Spread [2],[7] 18.00%    
PIK Rate [2],[7] 23.04%    
Investment, Identifier [Axis]: Joerns Healthcare, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 21.08% [2],[7],[13]   19.75% [1],[14]
Spread [2],[7],[13] 16.00%    
PIK Rate 21.08% [2],[7],[13]   19.75% [1],[14]
Investment, Identifier [Axis]: Johnson Downie Opco, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 11.50% [4],[9]   11.50% [6]
Investment, Identifier [Axis]: Johnson Downie Opco, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 16.25% [4]   15.63% [6]
Spread 11.50% [4]   11.50% [6]
Investment, Identifier [Axis]: JorVet Holdings, LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 12.00%   12.00%
Investment, Identifier [Axis]: KMS, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 12.00% [3],[4]   12.00% [5],[6]
Spread 7.25% [3],[4]   7.25% [5],[6]
Investment, Identifier [Axis]: KMS, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.00% [3],[4]   12.00% [5],[6]
Spread 7.25% [3],[4]   7.25% [5],[6]
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC, Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (18)    
Amount of Interest, Fees or Dividends Credited to Income 7    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 713    
Gross Additions 0    
Gross Reductions 18    
Ending balance 695    
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC, Member Units 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   (20)  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   3,695  
Gross Additions   0  
Gross Reductions   20  
Ending balance   3,675  
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC, Member Units 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   7  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   0  
Gross Reductions   0  
Ending balance   $ 0  
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC, Preferred 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 1,800    
Gross Additions 0    
Gross Reductions 0    
Ending balance $ 1,800    
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 12.00% 11.50% 11.50%
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 199 155  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 5,093 5,040  
Gross Additions 53 9  
Gross Reductions 0 0  
Ending balance $ 5,146 $ 5,049  
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.00% 9.00% 9.00%
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 22 22  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 961 970  
Gross Additions 0 0  
Gross Reductions 3 3  
Ending balance $ 958 967  
Investment, Identifier [Axis]: LL Management, Inc., Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 12.11% [3],[4],[7]   11.21% [5],[6]
Spread 7.25% [3],[4],[7]   7.25% [5],[6]
Investment, Identifier [Axis]: LL Management, Inc., Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.13% [3],[4],[7],[33]   11.67% [5],[6]
Spread 7.25% [3],[4],[7],[33]   7.25% [5],[6]
Investment, Identifier [Axis]: LL Management, Inc., Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 12.09% [3],[4],[7]   11.67% [5],[6]
Spread 7.25% [3],[4],[7]   7.25% [5],[6]
Investment, Identifier [Axis]: LLFlex, LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 13.75% [3],[4]   12.74% [5],[6]
Spread 9.00% [3],[4]   9.00% [5],[6]
Investment, Identifier [Axis]: Lightbox Holdings, L.P., Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 10.16% [2]   9.73% [1]
Spread 5.00% [2]   5.00% [1]
Investment, Identifier [Axis]: Logix Acquisition Company, LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 10.59% [3],[4]   10.13% [5],[6]
Spread 5.75% [3],[4]   5.75% [5],[6]
Investment, Identifier [Axis]: MB2 Dental Solutions, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.72% [2],[4],[7],[8]   10.42% [1],[6]
Spread 6.00% [2],[4],[7],[8]   6.00% [1],[6]
Investment, Identifier [Axis]: MB2 Dental Solutions, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.72% [2],[4],[7]   10.42% [1],[6]
Spread 6.00% [2],[4],[7]   6.00% [1],[6]
Investment, Identifier [Axis]: MH Corbin Holding LLC, Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   0  
Gross Reductions   0  
Ending balance   $ 0  
Investment, Identifier [Axis]: MH Corbin Holding LLC, Preferred Member Units 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 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    
Investment, Identifier [Axis]: MH Corbin Holding LLC, Preferred Member Units 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 0    
Gross Reductions 0    
Ending balance $ 0    
Investment, Identifier [Axis]: MH Corbin Holding LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 13.00% [15] 13.00% 13.00%
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 238 (374)  
Amount of Interest, Fees or Dividends Credited to Income 49 68  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,137 1,484  
Gross Additions 238 2  
Gross Reductions 29 394  
Ending balance $ 1,346 $ 1,092  
Investment, Identifier [Axis]: Mako Steel, LP, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 12.30% [3],[4]   11.79% [5],[6],[34]
Spread 7.25% [3],[4]   7.25% [5],[6],[34]
Investment, Identifier [Axis]: Mako Steel, LP, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.30% [3],[4]   11.09% [5],[6]
Spread 7.25% [3],[4]   7.25% [5],[6]
Investment, Identifier [Axis]: Market Force Information, LLC, Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 0    
Gross Reductions 0    
Ending balance $ 0    
Investment, Identifier [Axis]: Market Force Information, LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 12.00% [13] 12.00% 12.00% [14]
Spread   11.00%  
PIK Rate 12.00% [13]   12.00% [14]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (403) 0  
Amount of Interest, Fees or Dividends Credited to Income 0 3  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 403 2,234  
Gross Additions 0 3  
Gross Reductions 403 0  
Ending balance $ 0 2,237  
Investment, Identifier [Axis]: MetalForming AcquireCo, LLC, Preferred Equity      
Schedule of Investments [Line Items]      
Total Rate 8.00% [17]   8.00% [19]
Spread [19]     8.00%
PIK Rate [17] 8.00%    
Investment, Identifier [Axis]: MetalForming AcquireCo, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.75%   12.75%
Investment, Identifier [Axis]: Microbe Formulas, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 6.25% [3],[4],[7],[9]   6.25% [5],[6]
Investment, Identifier [Axis]: Microbe Formulas, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.09% [3],[4],[7]   9.86% [5],[6]
Spread 6.25% [3],[4],[7]   6.25% [5],[6]
Investment, Identifier [Axis]: Mills Fleet Farm Group, LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 11.08% [3],[4]   10.66% [5],[6]
Spread 6.25% [3],[4]   6.25% [5],[6]
Investment, Identifier [Axis]: MonitorUS Holding, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [3],[4],[35],[36] 12.11%    
Spread 7.00% [3],[4],[35],[36]   7.00% [5],[6],[37],[38]
Investment, Identifier [Axis]: MonitorUS Holding, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.73% [3],[4],[35],[36]   11.73% [5],[6],[37],[38]
Spread 7.00% [3],[4],[35],[36]   7.00% [5],[6],[37],[38]
Investment, Identifier [Axis]: MonitorUS Holding, LLC, Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 11.73% [3],[4],[35],[36]   11.73% [5],[6],[37],[38]
Spread 7.00% [3],[4],[35],[36]   7.00% [5],[6],[37],[38]
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC, Common Stock      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) $ 0 0  
Amount of Unrealized Gain/(Loss) 545 555  
Amount of Interest, Fees or Dividends Credited to Income 248 142  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 5,708 2,210  
Gross Additions 545 554  
Gross Reductions 0 0  
Ending balance 6,253 $ 2,764  
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC, Secured Debt      
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   39  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   1,595  
Gross Additions   0  
Gross Reductions   71  
Ending balance   1,524  
Investment, Identifier [Axis]: Mystic Logistics 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 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 0    
Gross Reductions 0    
Ending balance $ 0    
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.00%   10.00%
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 36    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,436    
Gross Additions 0    
Gross Reductions 0    
Ending balance $ 1,436    
Investment, Identifier [Axis]: NTM Acquisition Corp., Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 13.30% [2],[4],[7]   9.50% [1],[6]
Spread 7.25% [2],[4],[7]   6.25% [1],[6]
PIK Rate 1.00% [2],[4],[7]   1.00% [1],[6]
Investment, Identifier [Axis]: NWN Corporation, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 12.85% [3],[4],[7],[39]   10.85% [5],[6],[40]
Spread 8.00% [3],[4],[7],[39]   8.00% [5],[6],[40]
Investment, Identifier [Axis]: NWN Corporation, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.87% [3],[4],[7]   12.56% [5],[6]
Spread 8.00% [3],[4],[7]   8.00% [5],[6]
Investment, Identifier [Axis]: NWN Corporation, Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 20.00% [3]   20.00% [5]
PIK Rate 20.00% [3]   20.00% [5]
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) 470 0  
Amount of Interest, Fees or Dividends Credited to Income 33 5  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 280 670  
Gross Additions 470 0  
Gross Reductions 0 0  
Ending balance 750 $ 670  
Investment, Identifier [Axis]: NexRev LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate   11.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   215  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   3,510  
Gross Additions   6  
Gross Reductions   54  
Ending balance   3,462  
Investment, Identifier [Axis]: NexRev 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 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 0    
Gross Reductions 0    
Ending balance $ 0    
Investment, Identifier [Axis]: NexRev LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.00%   11.00%
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 249    
Amount of Interest, Fees or Dividends Credited to Income 81    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,119    
Gross Additions 255    
Gross Reductions 157    
Ending balance $ 2,217    
Investment, Identifier [Axis]: NinjaTrader, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 6.25% [3],[4],[9]   6.25% [5],[6]
Investment, Identifier [Axis]: NinjaTrader, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Spread 6.25% [3],[4],[9]   6.25% [5],[6]
Investment, Identifier [Axis]: NinjaTrader, LLC, Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 11.00% [3],[4]   9.99% [5],[6]
Spread 6.25% [3],[4]   6.25% [5],[6]
Investment, Identifier [Axis]: NuStep, LLC, Preferred Member Units      
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   3,380  
Gross Additions   0  
Gross Reductions   1  
Ending balance   $ 3,379  
Investment, Identifier [Axis]: NuStep, LLC, Preferred Member Units 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (100)    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,010    
Gross Additions 0    
Gross Reductions 100    
Ending balance 1,910    
Investment, Identifier [Axis]: NuStep, LLC, Preferred Member Units 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,290    
Gross Additions 0    
Gross Reductions 0    
Ending balance $ 1,290    
Investment, Identifier [Axis]: NuStep, LLC, Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.25% [4] 7.50% 10.63% [6]
Spread 6.50% [4] 6.50% 6.50% [6]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 1  
Amount of Interest, Fees or Dividends Credited to Income 31 11  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,100 430  
Gross Additions 0 300  
Gross Reductions 0 0  
Ending balance $ 1,100 $ 730  
Investment, Identifier [Axis]: NuStep, LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.00% 12.00% 12.00%
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 139 126  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 4,603 4,310  
Gross Additions 1 0  
Gross Reductions 0 0  
Ending balance $ 4,604 4,310  
Investment, Identifier [Axis]: OVG Business Services, LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 10.89% [3],[4]   10.64% [5],[6]
Spread 6.25% [3],[4]   6.25% [5],[6]
Investment, Identifier [Axis]: Oneliance, LLC, Preferred 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 264 264  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 264 $ 264  
Investment, Identifier [Axis]: Oneliance, LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 15.75% [4] 12.00% 15.13% [6]
Spread 11.00% [4] 11.00% 11.00% [6]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 56 44  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,380 1,374  
Gross Additions 2 1  
Gross Reductions 21 0  
Ending balance 1,361 1,375  
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) 430 0  
Amount of Interest, Fees or Dividends Credited to Income 67 48  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,940 2,500  
Gross Additions 430 0  
Gross Reductions 0 0  
Ending balance $ 3,370 $ 2,500  
Investment, Identifier [Axis]: Orttech Holdings, LLC, Secured Debt      
Schedule of Investments [Line Items]      
Total Rate   12.00%  
Spread   11.00%