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Note 5 - Other Investments (Details Textual) - USD ($) | 9 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Proceeds from Equity Method Investment, Distribution | $ 2,658,656 | $ 0
RGC Midstream LLC [Member] | MVP Southgate Investment [Member] |  |
Subsidiary, Ownership Percentage, Noncontrolling Owner | 1.00% |
Proceeds from Equity Method Investment, Distribution | $ 2,700,000 |
RGC Midstream LLC [Member] | MVP [Member] |  |
Equity Method Investment, Ownership Percentage | 1.00% |

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