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Significant Accounting Policies - Additional Information (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 27, 2023
USD ($)
Aug. 31, 2021
USD ($)
Jun. 30, 2023
USD ($)
$ / shares
shares
Jun. 30, 2022
USD ($)
shares
Jun. 30, 2023
USD ($)
Portfolio
$ / shares
shares
Jun. 30, 2022
USD ($)
shares
Sep. 30, 2022
USD ($)
Portfolio
Significant Accounting Policies [Line Items]              
Provision for taxes on net investment income     $ 200 $ 100 $ 800 $ 300  
Provision for taxes on unrealized appreciation (depreciation) on investments     0 0 2,900 (5,300)  
Deferred tax liability     1,600   1,600   $ 4,600
Net provision for taxes on realized gain on investments     0 $ 0 300 $ 0 0
Provision for taxes on net realized gain on investments     500   500    
Prepaid tax asset     1,200   $ 1,200    
Excise tax percentage         4.00%    
Effective tax rate before excise tax and income taxes         0.00%    
Federal statutory rate         21.00%    
Prepaid expenses and other assets     $ 817   $ 817   $ 748
Stock Issued During Period, Shares, New Issues | shares     5,805,484 136,072 10,191,661 2,464,910  
At The Market Offering [Member]              
Significant Accounting Policies [Line Items]              
Stock Issued During Period, Shares, New Issues | shares     5,805,484   5,891,661    
Weighted Average Price Per Share Of Common Stock Issued | $ / shares     $ 11.03   $ 11.04    
Proceeds from Issuance of Common Stock     $ 64,100   $ 65,100    
Deferred Offering Costs     $ 500   $ 500    
At The Market Offering [Member] | Prior Equity Distribution Agreements [Member]              
Significant Accounting Policies [Line Items]              
Aggregate Offering Price   $ 75,000          
At The Market Offering [Member] | Equity Distribution Agreements [Member]              
Significant Accounting Policies [Line Items]              
Aggregate Offering Price $ 100,000            
Past Due 30 Days or More              
Significant Accounting Policies [Line Items]              
Financing receivable, nonaccrual, percent past due on cost basis     1.00%   1.00%   0.90%
Financing receivable, nonaccrual, percent past due on fair value basis     0.00%   0.00%   0.00%
Number of portfolio on nonaccrual | Portfolio         3   2