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Borrowings - Additional Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jan. 17, 2024
Jun. 14, 2023
Nov. 18, 2022
Aug. 23, 2021
Mar. 31, 2021
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Debt Instrument [Line Items]                
Revolving credit facility           $ 47,500,000   $ 43,000,000
Fee Paid on Undrawn Amounts     0.50%          
Total borrowings           112,500,000   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%          
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           47,500,000   43,000,000
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
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           47,500,000   43,000,000
Capital One Revolving Finance | SPV LLC [Member]                
Debt Instrument [Line Items]                
Derivative, notional amount           170,800,000   167,700,000
Investments at fair value           153,000,000   153,400,000
Cash held by trustee           8,300,000   $ 5,000,000
Weighted average outstanding balance           $ 45,100,000 $ 70,000,000  
Weighted average interest rate           8.34% 7.75%  
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           5.08%   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   $ 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   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           $ 62,300,000   $ 59,900,000