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Note 7 - Derivatives and Hedging (Details Textual) $ in Millions	Apr. 01, 2022 USD ($)	Mar. 31, 2022	Nov. 01, 2021 USD ($)	Sep. 30, 2021	Sep. 24, 2021 USD ($)	Aug. 20, 2021 USD ($)	Jun. 30, 2019 USD ($)
Number of Interest Rate Derivatives Held		5
Unsecured Term Notes Payable, at 30-day SOFR Average 1.20% Due August 20, 2026 [Member]
Debt Instrument, Face Amount						$ 15
Unsecured Term Notes Payable, at 30-day LIBOR Plus 100 Basis Points, Due October 1, 2028 [Member]
Debt Instrument, Face Amount					$ 10
Unsecured Term Notes Payable, at 30-day LIBOR Plus 100 Basis Points, Due October 1, 2028 [Member] | Subsequent Event [Member]
Proceeds from Issuance of Debt	$ 5
Roanoke Gas Company [Member]
Number of Interest Rate Derivatives Held				2
Roanoke Gas Company [Member] | Unsecured Term Notes Payable, at 30-day SOFR Average 1.20% Due August 20, 2026 [Member]
Debt Instrument, Face Amount						15
Roanoke Gas Company [Member] | Unsecured Term Notes Payable, at 30-day LIBOR Plus 100 Basis Points, Due October 1, 2028 [Member]
Debt Instrument, Face Amount					10
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
Derivative, Fixed Interest Rate						2.00%
Roanoke Gas Company [Member] | Unsecured Debt [Member] | Unsecured Term Notes Payable, at 30-day LIBOR Plus 100 Basis Points, Due October 1, 2028 [Member]
Debt Instrument, Face Amount					$ 10
Derivative, Fixed Interest Rate					2.49%
Roanoke Gas Company [Member] | Unsecured Debt [Member] | Unsecured Term Notes Payable, at 30-day LIBOR Plus 100 Basis Points, Due October 1, 2028 [Member] | Subsequent Event [Member]
Proceeds from Issuance of Debt	$ 5
RGC Midstream LLC [Member]
Number of Interest Rate Derivatives Held		2
Debt Instrument, Number of Instruments					2
RGC Midstream LLC [Member] | Unsecured Debt [Member]
Debt Instrument, Face Amount			$ 8
Derivative, Fixed Interest Rate			2.443%
RGC Midstream LLC [Member] | Unsecured Debt [Member] | Unsecured Term Note Payable, at 30-day LIBOR Plus 1.15%, Due June 12, 2026 [Member]
Debt Instrument, Face Amount							$ 14
RGC Midstream LLC [Member] | Unsecured Debt [Member] | Unsecured Term Note Payable, at 30-day LIBOR Plus 1.20%, Due June 1, 2024 [Member]
Debt Instrument, Face Amount							$ 10
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR Plus 1.15% Due June 12, 2026 [Member]
Derivative, Fixed Interest Rate							3.24%
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR Plus 1.20%, Due June 1, 2024 [Member]
Derivative, Fixed Interest Rate							3.14%

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