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Note 5 - Other Investments (Details Textual) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Apr. 01, 2018
Public Utilities, Allowance for Funds Used During Construction, Additions | $ (0) | $ 55,980 |
RGC Midstream LLC [Member] |  |  |
Debt Instrument, Number of Instruments | 2 |  |
RGC Midstream LLC [Member] | MVP Southgate Investment [Member] |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  | 1.00%
RGC Midstream LLC [Member] | MVP [Member] |  |  |
Equity Method Investment, Ownership Percentage | 1.00% |  |
Roanoke Gas Company [Member] |  |  |
Public Utilities, Allowance for Funds Used During Construction, Additions |  | $ 55,981 |

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