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Borrowings - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 17, 2024
Jun. 14, 2023
Nov. 18, 2022
Aug. 23, 2021
Mar. 31, 2021
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Jun. 30, 2023
Debt Instrument [Line Items]                    
Revolving credit facility           $ 57,500,000   $ 57,500,000   $ 71,900,000
Fee Paid on Undrawn Amounts     0.50%              
Total borrowings           122,500,000   122,500,000    
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]                    
Debt Instrument Maturity Expiration Date Jan. 17, 2027                  
Borrowings interest rate spread (percent)     2.00%              
Debt instrument, maturity date Jan. 17, 2029                  
Fee Paid on Undrawn Amounts     0.75%              
Secured revolving credit facility   $ 100,000,000   $ 115,000,000            
Debt outstanding amount               57,500,000   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
Debt instrument, amendment date one   Jun. 14, 2023                
Debt instrument, amendment date two Jan. 17, 2024                  
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           57,500,000   57,500,000   71,900,000
Capital One Revolving Finance | SPV LLC [Member]                    
Debt Instrument [Line Items]                    
Derivative, notional amount           172,500,000   172,500,000   194,000,000
Investments at fair value           157,600,000   157,600,000   181,500,000
Cash held by trustee           10,200,000   10,200,000   $ 8,100,000
Weighted average outstanding balance           $ 63,600,000 $ 75,700,000 $ 68,200,000 $ 81,400,000  
Weighted average interest rate           8.34% 7.00% 7.98% 5.46%  
Capital One Revolving Finance | SOFR                    
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               5.35%    
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               $ 64,900,000    
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] | Level 3                    
Debt Instrument [Line Items]                    
Long-term debt, fair value           $ 59,300,000   $ 59,300,000