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Consolidated Schedule of Investments (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Percentage of debt securities contains floor rates 79.50% 77.40%
Aggregate cost of investments $ 543,601 $ 540,282
Aggregate gross unrealized appreciation 31,500 36,300
Aggregate gross unrealized depreciation 200 34,700
Net unrealized depreciation $ 31,300 $ 1,600
Percentage of qualifying assets to total assets 87.10% 86.60%
Maximum    
Schedule of Investments [Line Items]    
Floor rate 5.25%  
Floor rate   2.50%
Minimum    
Schedule of Investments [Line Items]    
Floor rate 0.50%  
Floor rate   0.50%
Investments    
Schedule of Investments [Line Items]    
Percentage of net asset value at fair value 224.00% 219.00%
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%
Junior Secured Loan    
Schedule of Investments [Line Items]    
Percentage of net asset value at fair value 17.00% 18.00%
Aggregate cost of investments $ 52,951 $ 53,888
Senior Unsecured Bond    
Schedule of Investments [Line Items]    
Percentage of net asset value at fair value   0.00%
Aggregate cost of investments   $ 416
Senior Unsecured Bond | Tank Partners Equipment Holdings, LLC    
Schedule of Investments [Line Items]    
Percentage of net asset value at fair value   10.00%
Equity Securities    
Schedule of Investments [Line Items]    
Percentage of net asset value at fair value 11.00% 10.00%
Aggregate cost of investments $ 34,077 $ 31,280
CLO Subordinated Investments    
Schedule of Investments [Line Items]    
Percentage of net asset value at fair value 4.00% 4.00%
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 25.00% 28.00%
Aggregate cost of investments $ 65,008 $ 71,415
Derivatives    
Schedule of Investments [Line Items]    
Percentage of net asset value at fair value 0.00% 0.00%
Aggregate cost of investments $ 31 $ 31
Senior Secured Loan    
Schedule of Investments [Line Items]    
Percentage of net asset value at fair value 166.00% 159.00%
Aggregate cost of investments $ 364,981 $ 356,358
Investments For Federal Income Tax Purpose    
Schedule of Investments [Line Items]    
Aggregate cost of investments $ 513,600 $ 539,800
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.