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Note 5 - Other Investments (Tables) | 9 Months Ended
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Jun. 30, 2025
Notes Tables |
Investment [Table Text Block] |
Balance Sheet location: |  | June 30, 2025 |  |  | September 30, 2024 |
Other Assets: |  |  |  |  |  |  |  |
MVP |  | $ | 20,717,161 |  |  | $ | 20,948,347 |
Southgate |  |  | 159,769 |  |  |  | 108,875 |
Investment in unconsolidated affiliates |  | $ | 20,876,930 |  |  | $ | 21,057,222 |
|  | Nine Months Ended June 30, |
|  | 2025 |  |  | 2024 |
Cash investment |  | $ | 50,894 |  |  | $ | 8,743 |
Equity in earnings of unconsolidated affiliate |  |  | 2,427,470 |  |  |  | 2,979,823 |
Distribution from unconsolidated affiliate |  |  | (2,658,656 | ) |  |  | — |
Change in investment in unconsolidated affiliates |  | $ | (180,292 | ) |  | $ | 2,988,566 |
Equity Method Investments [Table Text Block] |
|  | Income Statements |
|  | Three Months Ended June 30, |  |  | Nine Months Ended June 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Revenue |  | $ | 139,410,586 |  |  | $ | 3,723,469 |  |  | $ | 424,079,412 |  |  | $ | 3,723,469 |
Operating expenses |  |  | (75,210,039 | ) |  |  | (10,822,325 | ) |  |  | (221,547,701 | ) |  |  | (10,822,325 | )
AFUDC |  |  | 45,553 |  |  |  | 38,815,497 |  |  |  | 111,088 |  |  |  | 343,916,298 |
Other income, net |  |  | 1,612,418 |  |  |  | 1,899,904 |  |  |  | 4,989,603 |  |  |  | 7,799,966 |
Net income |  | $ | 65,858,518 |  |  | $ | 33,616,545 |  |  | $ | 207,632,402 |  |  | $ | 344,617,408 |
|  | Balance Sheets |
|  | June 30, 2025 |  |  | September 30, 2024 |
Assets: |  |  |  |  |  |  |  |
Current assets |  | $ | 229,791,783 |  |  | $ | 263,966,727 |
Construction work in progress |  |  | — |  |  |  | 1,568,267 |
Property, plant and equipment, net |  |  | 9,448,500,810 |  |  |  | 9,522,815,742 |
Other assets |  |  | 8,963,640 |  |  |  | 13,732,299 |
Total assets |  | $ | 9,687,256,233 |  |  | $ | 9,802,083,035 |
Liabilities and Equity: |  |  |  |  |  |  |  |
Current liabilities |  | $ | 69,667,426 |  |  | $ | 168,645,751 |
Noncurrent liabilities |  |  | 1,120,286 |  |  |  | 68,965 |
Capital |  |  | 9,616,468,521 |  |  |  | 9,633,368,319 |
Total liabilities and equity |  | $ | 9,687,256,233 |  |  | $ | 9,802,083,035 |

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