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Borrowings - Additional Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Nov. 18, 2022
Aug. 23, 2021
Mar. 31, 2021
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Jun. 14, 2023
Debt Instrument [Line Items]              
Revolving credit facility       $ 69,000,000   $ 71,900,000  
Total borrowings       134,000,000      
Redeemed principal amount       2,000      
Capital One Revolving Finance              
Debt Instrument [Line Items]              
Debt instrument, maturity date   Aug. 22, 2026          
Secured revolving credit facility   $ 115,000,000         $ 100,000,000
Debt outstanding amount       69,000,000   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 | Level 3              
Debt Instrument [Line Items]              
Total borrowings       69,000,000   71,900,000  
Capital One Revolving Finance | SPV LLC [Member]              
Debt Instrument [Line Items]              
Derivative, notional amount       200,000,000   194,000,000  
Investments at Fair Value       185,500,000   181,500,000  
Cash held by trustee       14,200,000   $ 8,100,000  
Weighted average outstanding balance       $ 70,000,000 $ 81,900,000    
Weighted average interest rate       7.75% 4.56%    
Capital One Revolving Finance | SOFR              
Debt Instrument [Line Items]              
Borrowings interest rate spread (percent) 2.50%            
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       5.33%      
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      
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 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       $ 58,200,000