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Note 12 - Contingencies and Commitments (Details Textual) - USD ($) | 3 Months Ended
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Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021
Dividends, Common Stock, Cash |  | $ 335,000 | $ 335,000 | $ 338,000 | $ 338,000
Monthly Dividend [Member] | Forecast [Member] |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.0075 |  |  |  |
Dividends, Common Stock, Cash | $ 335,000 |  |  |  |

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