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Note 9 - Long-term Debt (Details Textual)					3 Months Ended	9 Months Ended
	Jul. 28, 2023	Jun. 28, 2023 USD ($)	Mar. 24, 2023 USD ($)	Jun. 30, 2022	Dec. 31, 2023 USD ($)	Jun. 30, 2023	Sep. 30, 2023 USD ($)	Apr. 03, 2023 USD ($)	Aug. 20, 2021 USD ($)
Regulatory Asset					$ 8,218,209		$ 8,243,721
Debt Instrument, Debt Covenant Ratio of Long-term Debt to Total Capitalization, Maximum					65.00%
Debt Instrument, Debt Covenant, Ratio of Priority Debt to Total Assets, Maximum					15.00%
Debt Instrument, Debt Covenant, Interest Coverage Ratio						1.5
Deferred Gain (Loss) on Early Extinguishment of Debt [Member]
Regulatory Asset					$ 1,227,512		$ 1,256,059
Regulatory Asset, Amortization Period (Year)					20 years
Amended and Restated Delayed Term Note Entered September 24, 2021 [Member]
Debt Instrument, Face Amount								$ 10,000,000
Unsecured Term Notes Payable, at 30-day SOFR Average 1.20% Due August 20, 2026 [Member]
Debt Instrument, Face Amount									$ 15,000,000
RGC Midstream LLC [Member]
Derivative, Fixed Interest Rate								2.49%
RGC Midstream LLC [Member] | Unsecured Promissory Notes [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	2.00%			1.50%
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured term note payable, at Daily Simple SOFR plus 1.26448%, due June 12, 2026[Member]
Debt Instrument, Face Amount		$ 14,000,000
Derivative, Fixed Interest Rate		3.24%
RGC Midstream LLC [Member] | Unsecured Debt [Member]
Debt Instrument, Face Amount		$ 8,000,000			$ 8,000,000
Derivative, Fixed Interest Rate		2.443%			2.443%
RGC Midstream LLC [Member] | Unsecured Debt [Member] | London Interbank Offered Rate (LIBOR) 1 [Member]
Debt Instrument, Basis Spread on Variable Rate		1.15%
RGC Midstream LLC [Member] | Unsecured Debt [Member] | Secured Overnight Financing Rate (SOFR) [Member]
Debt Instrument, Basis Spread on Variable Rate		1.26448%
Roanoke Gas Company [Member] | Amended and Restated Delayed Term Note Entered September 24, 2021 [Member]
Debt Instrument, Face Amount			$ 10,000,000
Debt Instrument, Basis Spread on Variable Rate			1.00%
Roanoke Gas Company [Member] | Amended and Restated Delayed Term Note Entered September 24, 2021 [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate			1.00%
Roanoke Gas Company [Member] | Unsecured Debt [Member] | Unsecured Term Notes Payable, at 30-day SOFR Average 1.20% Due August 20, 2026 [Member]
Debt Instrument, Face Amount					$ 15,000,000
Derivative, Fixed Interest Rate					2.00%

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