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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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