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Note 5 - Other Investments - Schedule of Other Investments (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Sep. 30, 2023
Investment in unconsolidated affiliates | $ 20,175,659 |  | $ 20,175,659 |  | $ 17,187,093
Equity in earnings of unconsolidated affiliate | 282,604 | $ 519,482 | 2,979,823 | $ 523,581 |
Undistributed earnings, net of income taxes, of MVP in retained earnings, excluding impairment | 11,896,616 |  | 11,896,616 |  | 9,683,797
Cash investment |  |  | 8,743 | 2,132,679 |
Change in accrued capital calls |  |  | 0 | (803,998) |
Change in investment in unconsolidated affiliates |  |  | 2,988,566 | $ 1,852,262 |
MVP [Member] |  |  |  |  |
Investment in unconsolidated affiliates | 20,076,299 |  | 20,076,299 |  | 17,096,476
Southgate [Member] |  |  |  |  |
Investment in unconsolidated affiliates | $ 99,360 |  | $ 99,360 |  | $ 90,617

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