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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

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