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Agreements and Related Party Transactions - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Related Party Transaction [Line Items]          
Administrative services expenses $ 445,000 $ 314,000 $ 1,335,000 $ 997,000  
Other payable to administrator 640,000   $ 640,000   $ 555,000
Annual base management fee calculation in percentage of gross assets     1.25%    
Management fee, description     Under the terms of the Investment Advisory Agreement, the Adviser has voluntarily waived its right to receive management fees on the Company’s investments in WhiteHawk III Onshore Fund LP and Freeport Financial SBIC Fund LP for any period in which these investments remain in the investment portfolio.    
Management fee 5,130,000 5,119,000 $ 15,257,000 15,133,000  
Management fees waiver 11,000 30,000 44,000 101,000  
Management fees payable 5,119,000   $ 5,119,000   5,066,000
Income incentive fee percent payable quarterly in excess of pre-incentive fee net investment income     100.00%    
Income incentive fee quarterly return on investment income percent     1.75%    
Income incentive fee annual return on investment income percent     7.00%    
Percent of pre-incentive fee net investment income received to obtain catch-up feature     17.50%    
Pre-incentive fee net investment income percent catch-up     2.1212%    
Pre-incentive fee net investment income percent in excess of catch-up     17.50%    
Capital gains incentive fee percent payable annually     17.50%    
Income incentive fee incurred 3,586,000 4,976,000 $ 10,684,000 14,518,000  
Income incentive fee waived 12,000 $ 77,000 67,000 $ 114,000  
Income incentive fees unpaid     $ 3,574,000   $ 4,305,000
Incentive fee on cumulative unrealized capital appreciation description.     This accrual is calculated using the aggregate cumulative realized capital gains and losses and aggregate cumulative unrealized capital appreciation or depreciation. If such amount is positive at the end of a period, then the Company records a capital gains incentive fee equal to 17.5% of such amount, minus the aggregate amount of actual incentive fees based on capital gains paid in all prior periods. If such amount is negative, then there is no accrual for such period. There can be no assurance that such unrealized capital appreciation will be realized in the future    
Capital gains incentive fees on unrealized capital appreciation $ 0   $ 0    
Percentage of outstanding common stock owned 2.81%   2.81%   2.74%
Capital gains incentive fees remain outstanding     $ 0   $ 0
Non-controlled Affiliated Investments          
Related Party Transaction [Line Items]          
Percentage of outstanding voting securities owned     5.00%   5.00%
Controlled Investments          
Related Party Transaction [Line Items]          
Percentage of outstanding voting securities owned     25.00%   25.00%
Minimum | Non-controlled Affiliated Investments          
Related Party Transaction [Line Items]          
Percentage of outstanding voting securities owned     5.00%    
Minimum | Controlled Investments          
Related Party Transaction [Line Items]          
Percentage of outstanding voting securities owned     25.00%    
Sun Life Financial Inc          
Related Party Transaction [Line Items]          
Percentage of outstanding common stock owned 6.01%   6.01%   6.01%
Sun Life Financial Inc | Series 2023A Unsecured Notes          
Related Party Transaction [Line Items]          
Participating lender amount     $ 50,000,000    
Sun Life Financial Inc | 2026 Unsecured Notes          
Related Party Transaction [Line Items]          
Participating lender amount     10,000,000    
Sun Life Financial Inc | 2028 Unsecured Notes          
Related Party Transaction [Line Items]          
Participating lender amount     2,000,000    
Sun Life Financial Inc | 2030 Unsecured Notes          
Related Party Transaction [Line Items]          
Participating lender amount     $ 10,000,000