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Borrowings - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Nov. 18, 2022
Aug. 23, 2021
Mar. 31, 2021
Nov. 20, 2017
Apr. 15, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Jun. 30, 2022
Dec. 05, 2021
Jun. 21, 2019
Debt Instrument [Line Items]                        
Revolving credit facility           $ 78,400,000   $ 78,400,000   $ 84,000,000    
Total borrowings           143,400,000   143,400,000        
Redeemed principal amount               2,000        
Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Line of Credit Facility, maximum borrowing capacity                       $ 50,000,000
Line of Credit Facility, remaining borrowing capacity                     $ 20,000,000.0 $ 30,000,000.0
Fee Paid on Undrawn Amounts                     0.75%  
London Interbank Offered Rate (LIBOR)                        
Debt Instrument [Line Items]                        
Bore interest rate per annum       3.15%                
Term Financing                        
Debt Instrument [Line Items]                        
Related party transaction                     $ 122,000,000.0  
Borrowings under the Term Financing         $ 102,000,000.0              
Repayments of Debt         $ 20,000,000.0              
Term Financing | London Interbank Offered Rate (LIBOR) | December 5 2019 - December 4 2020 [Member]                        
Debt Instrument [Line Items]                        
Borrowings interest rate spread (percent)         3.55%              
Term Financing | London Interbank Offered Rate (LIBOR) | December 5 2020 - December 4 2021 [Member]                        
Debt Instrument [Line Items]                        
Borrowings interest rate spread (percent)         3.15%              
Capital One Revolving Finance                        
Debt Instrument [Line Items]                        
Debt Outstanding Amount               78,400,000   84,000,000.0    
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.                      
Derivative, notional amount                   188,600,000    
Investments at Fair Value                   183,500,000    
Accrued Interest Receivable           0   0        
Cash held by trustee                   6,600,000    
Weighted average outstanding balance               84,100,000        
Capital One Revolving Finance | Fair Value, Inputs, Level 3                        
Debt Instrument [Line Items]                        
Total borrowings           78,400,000   78,400,000   $ 84,000,000.0    
Capital One Revolving Finance | SPV LLC [Member]                        
Debt Instrument [Line Items]                        
Derivative, notional amount           194,900,000   194,900,000        
Investments at Fair Value           187,800,000   187,800,000        
Cash held by trustee           7,900,000   $ 7,900,000        
Weighted average outstanding balance           $ 86,400,000 $ 101,600,000   $ 101,800,000      
Weighted average interest rate           6.12% 2.90% 5.34% 3.07%      
Capital One Revolving Finance | Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Secured revolving credit facility   $ 115,000,000                    
Reinvestment period   3 years                    
Amortization Period   2 years                    
Capital One Revolving Finance | SOFR [Member]                        
Debt Instrument [Line Items]                        
Borrowings interest rate spread (percent) 2.50%                      
Payment of an upfront fee $ 1,300,000                      
Debt instrument, interest rate during period 2.00%                      
2026 Notes [Member]                        
Debt Instrument [Line Items]                        
Debt Instrument, maturity date     Apr. 01, 2026                  
Debt instrument, interest rate during period               5.54%        
Proceeds from initial public offering     $ 65,000,000                  
Debt instrument interest rate     4.875%                  
Payments for underwriting expense     $ 1,300,000                  
Proceeds from sale of notes     63,100,000                  
Offering expense     $ 215,000                  
Aggregate principal amount           $ 65,000,000.0   $ 65,000,000.0        
Debt instrument, interest rate, stated percentage     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 years        
2026 Notes [Member] | Maximum                        
Debt Instrument [Line Items]                        
Redemption notice period               60 years        
2026 Notes [Member] | Fair Value, Inputs, Level 3                        
Debt Instrument [Line Items]                        
Long-term debt, fair value           $ 57,200,000   $ 57,200,000