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Significant Accounting Policies - Additional Information (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
Portfolio
Dec. 31, 2021
USD ($)
Sep. 30, 2022
USD ($)
Portfolio
Significant Accounting Policies [Line Items]      
Provision for taxes on net investment income $ 534,000 $ 100,000  
Provision for taxes on net unrealized gain on investments 700,000 1,500,000  
Deferred tax liability 5,300,000   $ 4,600,000
Provision for taxes on net realized gain on investments 0 $ 0  
Prepaid tax asset $ 0    
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 $ 945,000   $ 748,000
Past Due 30 Days or More      
Significant Accounting Policies [Line Items]      
Financing receivable, nonaccrual, percent past due on cost basis 1.90%   0.90%
Financing receivable, nonaccrual, percent past due on fair value basis 0.60%   0.00%
Number of portfolio on nonaccrual | Portfolio 3   2