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Consolidated Schedule of Investments (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Investments [Line Items]      
Percentage of debt securities contains floor rates 77.40%   78.80%
Aggregate cost of investments $ 540,282 $ 652,217  
Aggregate gross unrealized appreciation 36,300   $ 800
Aggregate gross unrealized depreciation 34,700   $ 300
Net unrealized depreciation $ 1,600 $ 3,400  
Percentage of qualifying assets to total assets 86.60%   82.40%
Maximum      
Schedule of Investments [Line Items]      
Floor rate 2.50% 2.00%  
Minimum      
Schedule of Investments [Line Items]      
Floor rate 0.50% 0.50%  
Investments      
Schedule of Investments [Line Items]      
Percentage of net asset value at fair value (219.00%) 247.00%  
Garrison Capital Equity Holdings II LLC      
Schedule of Investments [Line Items]      
Non controlling member interest rate 17.50%   17.50%
ATP Oil & Gas Corporation      
Schedule of Investments [Line Items]      
Royalty interest 5.00%   5.00%
Senior Secured Loan      
Schedule of Investments [Line Items]      
Percentage of net asset value at fair value 159.00% 180.00%  
Aggregate cost of investments $ 356,358 $ 435,856  
Junior Secured Loan      
Schedule of Investments [Line Items]      
Percentage of net asset value at fair value 18.00% 24.00%  
Aggregate cost of investments $ 53,888 $ 65,776  
Senior Unsecured Bond      
Schedule of Investments [Line Items]      
Percentage of net asset value at fair value 0.00% 0.00%  
Aggregate cost of investments $ 416 $ 416  
Senior Unsecured Bond | Tank Partners Equipment Holdings, LLC      
Schedule of Investments [Line Items]      
Percentage of net asset value at fair value 10.00% 10.00%  
Equity Securities      
Schedule of Investments [Line Items]      
Percentage of net asset value at fair value 10.00% 9.00%  
Aggregate cost of investments $ 31,280 $ 28,848  
Investments For Federal Income Tax Purpose      
Schedule of Investments [Line Items]      
Aggregate cost of investments $ 539,800   $ 656,000
CLO Subordinated Investments      
Schedule of Investments [Line Items]      
Percentage of net asset value at fair value 4.00% 9.00%  
Asset Manager Affiliates      
Schedule of Investments [Line Items]      
Percentage of net asset value at fair value 0.00% 0.00%  
Aggregate cost of investments [1] $ 17,791 $ 17,791  
Joint Ventures      
Schedule of Investments [Line Items]      
Percentage of net asset value at fair value 28.00% 25.00%  
Aggregate cost of investments $ 71,415 $ 68,850  
Derivatives      
Schedule of Investments [Line Items]      
Percentage of net asset value at fair value 0.00% 0.00%  
Aggregate cost of investments $ 31 $ 31  
Controlled Affiliated Investments | Minimum      
Schedule of Investments [Line Items]      
Percentage of outstanding voting securities owned 25.00%   25.00%
Non-controlled Affiliated Investments | Minimum      
Schedule of Investments [Line Items]      
Percentage of outstanding voting securities owned 5.00%   5.00%
[1] Represents the equity investment in the Asset Manager Affiliates.