| Investment [Table Text Block] |
| Balance Sheet location: | | June 30, 2026 | | | September 30, 2025 | |
| Other Assets: | | | | | | | | |
| MVP | | $ | 20,604,780 | | | $ | 20,538,437 | |
| Southgate | | | 997,677 | | | | 185,260 | |
| Boost | | | 659,436 | | | | — | |
| Investment in unconsolidated affiliates | | $ | 22,261,893 | | | $ | 20,723,697 | |
| | | Nine Months Ended June 30, | |
| | | 2026 | | | 2025 | |
| Cash investment | | $ | 1,015,960 | | | $ | 50,894 | |
| Change in accrued capital calls | | | 392,163 | | | | — | |
| Equity in earnings of unconsolidated affiliates | | | 2,495,239 | | | | 2,427,470 | |
| Distributions from unconsolidated affiliate | | | (2,365,166 | ) | | | (2,658,656 | ) |
| Change in investment in unconsolidated affiliates | | $ | 1,538,196 | | | $ | (180,292 | ) |
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| Equity Method Investments [Table Text Block] |
| | | Income Statements | |
| | | Three Months Ended June 30, | | | Nine Months Ended June 30, | |
| | | 2026 | | | 2025 | | | 2026 | | | 2025 | |
| Revenue | | $ | 139,467,118 | | | $ | 139,410,586 | | | $ | 437,766,773 | | | $ | 424,079,412 | |
| Operating expenses | | | (80,999,977 | ) | | | (75,210,039 | ) | | | (234,212,807 | ) | | | (221,547,701 | ) |
| AFUDC | | | 4,344,515 | | | | 45,553 | | | | 10,100,575 | | | | 111,088 | |
| Other income, net | | | 1,311,601 | | | | 1,612,418 | | | | 3,151,190 | | | | 4,989,603 | |
| Net income | | $ | 64,123,257 | | | $ | 65,858,518 | | | $ | 216,805,731 | | | $ | 207,632,402 | |
| | | Balance Sheets | |
| | | June 30, 2026 | | | September 30, 2025 | |
| Assets: | | | | | | | | |
| Current assets | | $ | 278,541,678 | | | $ | 173,283,635 | |
| Construction work in progress | | | 221,058,546 | | | | — | |
| Property, plant and equipment, net | | | 9,309,980,290 | | | | 9,418,928,665 | |
| Other assets | | | 42,990,188 | | | | 1,789,092 | |
| Total assets | | $ | 9,852,570,702 | | | $ | 9,594,001,392 | |
| | | | | | | | | |
| Liabilities and Equity: | | | | | | | | |
| Current liabilities | | $ | 68,352,629 | | | $ | 40,148,017 | |
| Noncurrent liabilities | | | 2,907,315 | | | | 1,084,072 | |
| Capital | | | 9,781,310,758 | | | | 9,552,769,303 | |
| Total liabilities and equity | | $ | 9,852,570,702 | | | $ | 9,594,001,392 | |
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