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Note 6 - Other Investments - Investment in Unconsolidated Entity (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Other income, net | $ 120,786 | $ 74,606 |  |
Net income | 5,019,992 | 3,256,405 |  |
Current assets | 34,769,875 |  | $ 26,795,262 |
Total assets | 314,703,235 |  | 303,729,340 |
Current liabilities | 64,196,722 |  | 32,918,787 |
Capital | 103,544,603 | 94,890,007 | 100,732,625 | $ 93,090,656
Total liabilities and equity | 314,703,235 |  | 303,729,340 |
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |  |  |
Current assets | 349,417,551 |  | 795,787,358 |
Construction work in progress | 8,468,379,830 |  | 7,499,128,254 |
Other assets | 12,160,170 |  | 11,639,586 |
Total assets | 8,829,957,551 |  | 8,306,555,198 |
Current liabilities | 371,508,693 |  | 236,947,158 |
Capital | 8,458,448,858 |  | 8,069,608,040 |
Total liabilities and equity | 8,829,957,551 |  | $ 8,306,555,198 |
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | MVP [Member] |  |  |  |
AFUDC | 158,562,141 | 0 |  |
Other income, net | 2,663,569 | 160,472 |  |
Net income | $ 161,225,710 | $ 160,472 |  |

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