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Note 5 - Other Investments - Schedule of Other Investments (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Sep. 30, 2024
Investment in unconsolidated affiliates | $ 20,876,930 |  | $ 20,876,930 |  | $ 21,057,222
Cash investment |  |  | 50,894 | $ 8,743 | 18,258
Equity in earnings of unconsolidated affiliate | 772,082 | $ 282,604 | 2,427,470 | 2,979,823 |
Distribution from unconsolidated affiliate |  |  | (2,658,656) | 0 |
Change in investment in unconsolidated affiliates |  |  | (180,292) | $ 2,988,566 |
MVP [Member] |  |  |  |  |
Investment in unconsolidated affiliates | 20,717,161 |  | 20,717,161 |  | 20,948,347
Southgate [Member] |  |  |  |  |
Investment in unconsolidated affiliates | $ 159,769 |  | $ 159,769 |  | $ 108,875

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