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Note 5 - Other Investments - Schedule of Other Investments (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023
Investment in unconsolidated affiliates | $ 19,887,693 |  | $ 19,887,693 |  | $ 17,187,093
Equity in earnings of unconsolidated affiliate | 1,229,384 | $ 2,867 | 2,697,219 | $ 4,099 |
Undistributed earnings, net of income taxes, of MVP in retained earnings, excluding impairment | 11,686,753 |  | 11,686,753 |  | 9,683,797
Cash investment |  |  | 3,381 | 1,499,337 |
Change in accrued capital calls |  |  | 0 | (179,436) |
Change in investment in unconsolidated affiliates |  |  | 2,700,600 | $ 1,324,000 |
MVP [Member] |  |  |  |  |
Investment in unconsolidated affiliates | 19,793,695 |  | 19,793,695 |  | 17,096,476
Southgate [Member] |  |  |  |  |
Investment in unconsolidated affiliates | $ 93,998 |  | $ 93,998 |  | $ 90,617

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