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DISTRIBUTIONS TO COMMON STOCKHOLDERS - Components of Our Net Assets on a Tax Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | --- | --- | ---
Equity [Abstract] |  |  |  |  |
Common stock | [1] | $ 44 | $ 44 |  |
Capital in excess of par value |  | 492,305 | 481,480 |  |
Cumulative net unrealized appreciation (depreciation) of investments |  | 25,249 | (17,454) |  |
Undistributed ordinary income |  | 6,590 | 4,978 |  |
Capital loss carryforward |  | (47,435) | (54,425) |  |
Other temporary differences |  | (5,858) | (5,928) |  |
TOTAL NET ASSETS |  | $ 470,895 | $ 408,695 | $ 315,487 | $ 318,439
[1] | Issued and outstanding shares of common stock and net asset value per share have been adjusted on a retroactive basis to reflect the 1-for-2 reverse stock split (the “Reverse Stock Split”) effected on April 4, 2024. Refer to Note 2—Summary of Significant Accounting Policies for additional information.

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