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Borrowings - Additional Information (Details) - USD ($)
 12 Months Ended
Jan. 17, 2024
Jun. 14, 2023
Nov. 18, 2022
Aug. 23, 2021
Mar. 31, 2021
Sep. 30, 2020
Apr. 15, 2020
Jun. 30, 2024
Jun. 30, 2023
Dec. 04, 2021
Dec. 04, 2020
Dec. 05, 2021
Jun. 21, 2019
Nov. 20, 2017
Debt Instrument [Line Items]                            
Revolving credit facility               $ 43,000,000 $ 71,900,000          
Fee Paid on Undrawn Amounts     0.50%                      
Total borrowings               108,000,000            
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%                      
Revolving Financing Facility                            
Debt Instrument [Line Items]                            
Debt Outstanding Amount               0 0          
London Interbank Offered Rates (LIBOR) [Member]                            
Debt Instrument [Line Items]                            
Borrowings interest rate spread (percent)                     3.55%      
Bore interest rate per annum           3.15%                
Fee Paid on Undrawn Amounts           0.75%                
Term Financing                            
Debt Instrument [Line Items]                            
Borrowings under the Term Financing             $ 102,000,000              
Repayments of Debt             $ 20,000,000              
Debt Outstanding Amount               0 0          
Term Financing | London Interbank Offered Rates (LIBOR) [Member]                            
Debt Instrument [Line Items]                            
Borrowings interest rate spread (percent)                   3.15%        
Term Financing | Related Party [Member]                            
Debt Instrument [Line Items]                            
Other Liabilities                       $ 122,000,000    
Capital One Revolving Finance                            
Debt Instrument [Line Items]                            
Borrowings interest rate spread (percent)     2.00%                      
Debt instrument fee percentage     1.125%                      
Revolving credit facility                           $ 50,000,000
Line of Credit Facility, remaining borrowing capacity           $ 20,000,000             $ 30,000,000  
Debt Instrument, maturity date Jan. 17, 2029         Dec. 05, 2021                
Fee Paid on Undrawn Amounts     0.75%                      
Secured revolving credit facility   $ 100,000,000   $ 115,000,000                    
Debt instrument, amendment date one   Jun. 14, 2023                        
Debt instrument, amendment date two Jan. 17, 2024                          
Debt Instrument Maturity Expiration Date Jan. 17, 2027                          
Debt Outstanding Amount               43,000,000 71,900,000          
Reinvestment period       3 years                    
Amortization Period       2 years                    
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          
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 | Fair Value, Inputs, Level 3                            
Debt Instrument [Line Items]                            
Total borrowings               43,000,000 71,900,000          
Capital One Revolving Finance | SPV LLC [Member]                            
Debt Instrument [Line Items]                            
Derivative, notional amount               167,700,000 194,000,000          
Investments at Fair Value               153,400,000 181,500,000          
Cash held by trustee               5,000,000 8,100,000          
Weighted average outstanding balance               $ 63,700,000 $ 80,400,000          
Weighted average interest rate               8.09% 5.95%          
Capital One Revolving Finance | SOFR [Member]                            
Debt Instrument [Line Items]                            
Borrowings interest rate spread (percent)     3.10%                      
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               5.29%            
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            
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               $ 64,900,000            
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] | Fair Value, Inputs, Level 3                            
Debt Instrument [Line Items]                            
Long-term debt, fair value               $ 59,900,000