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Borrowings - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Nov. 18, 2022
Aug. 23, 2021
Mar. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Jun. 30, 2023
Jun. 14, 2023
Debt Instrument [Line Items]                  
Revolving credit facility       $ 70,000,000   $ 70,000,000   $ 71,900,000  
Fee Paid on Undrawn Amounts 0.50%                
Total borrowings       135,000,000   135,000,000      
Redeemed principal amount           2,000      
Minimum                  
Debt Instrument [Line Items]                  
Fee Paid on Undrawn Amounts 0.25%                
Maximum                  
Debt Instrument [Line Items]                  
Fee Paid on Undrawn Amounts 75.00%                
Capital One Revolving Finance                  
Debt Instrument [Line Items]                  
Borrowings interest rate spread (percent) 2.00%                
Debt instrument, maturity date   Aug. 23, 2026              
Fee Paid on Undrawn Amounts 0.75%                
Secured revolving credit facility   $ 115,000,000             $ 100,000,000
Debt outstanding amount           70,000,000   71,900,000  
Reinvestment period   3 years              
Amortization period   2 years              
Debt instrument fee percentage 1.125%                
Debt instrument, unused borrowing capacity, description The Capital One Revolving Financing required the payment of an upfront fee of 1.125% ($1.3 million) of the available borrowings under the Capital One Revolving Financing at the closing, and requires the payment of an unused fee of (i) 0.75% annually for any undrawn amounts below 50% of the Capital One Revolving Financing, (ii) 0.50% annually for any undrawn amounts between 50% and 75% of the Capital One Revolving Financing, and (iii) 0.25% annually for any undrawn amounts above 75% of the Capital One Revolving Financing. Borrowings under the Capital One Revolving Financing are based on a borrowing base.                
Accrued interest receivable       0   0   0  
Capital One Revolving Finance | Minimum                  
Debt Instrument [Line Items]                  
Fee Paid on Undrawn Amounts 50.00%                
Capital One Revolving Finance | Maximum                  
Debt Instrument [Line Items]                  
Fee Paid on Undrawn Amounts 75.00%                
Capital One Revolving Finance | Level 3                  
Debt Instrument [Line Items]                  
Total borrowings       70,000,000   70,000,000   71,900,000  
Capital One Revolving Finance | SPV LLC [Member]                  
Debt Instrument [Line Items]                  
Derivative, notional amount       186,600,000   186,600,000   194,000,000  
Investments at fair value       169,900,000   169,900,000   181,500,000  
Cash held by trustee       11,600,000   11,600,000   $ 8,100,000  
Weighted average outstanding balance       $ 70,800,000 $ 86,400,000 $ 70,000,000 $ 84,100,000    
Weighted average interest rate       7.88% 6.12% 7.75% 5.34%    
Capital One Revolving Finance | SOFR                  
Debt Instrument [Line Items]                  
Borrowings interest rate spread (percent) 2.50%                
Payment of an upfront fee $ 1,300,000                
2026 Notes [Member]                  
Debt Instrument [Line Items]                  
Debt instrument, maturity date     Apr. 01, 2026            
Debt instrument, interest rate during period           5.17%      
Proceeds from initial public offering     $ 65,000,000            
Debt instrument interest rate     4.875%         4.875%  
Payments for underwriting expense     $ 1,300,000            
Proceeds from sale of notes     63,100,000            
Offering expense     $ 215,000            
Aggregate principal amount       $ 65,000,000   $ 65,000,000      
Debt instrument, interest rate, stated percentage     4.875%         4.875%  
Debt instrument, description of variable rate basis           (1) 100% of the principal amount of the 2026 Notes to be redeemed or (2) the sum of the present values of the remaining scheduled payments of principal and interest (exclusive of accrued and unpaid interest to the date of redemption) on the 2026 Notes to be redeemed, discounted to the redemption date on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) using the applicable Treasury Rate plus 50 basis points; provided      
Debt instrument, redemption price, percentage           100.00%      
Redeemed principal amount           $ 64,800,000      
2026 Notes [Member] | Minimum                  
Debt Instrument [Line Items]                  
Redemption notice period           30 days      
2026 Notes [Member] | Maximum                  
Debt Instrument [Line Items]                  
Redemption notice period           60 days      
2026 Notes [Member] | Level 3                  
Debt Instrument [Line Items]                  
Long-term debt, fair value       $ 59,300,000   $ 59,300,000