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Note 8 - Derivatives and Hedging (Details Textual) $ in Millions	Jun. 30, 2024 USD ($)	Jun. 28, 2023 USD ($)	Apr. 03, 2023	Aug. 20, 2021 USD ($)
Number of Interest Rate Derivatives Held	4
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]
Number of Interest Rate Derivatives Held	2
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%
RGC Midstream LLC [Member]
Derivative, Fixed Interest Rate			2.49%
RGC Midstream LLC [Member] | Unsecured Debt [Member]
Debt Instrument, Face Amount	$ 8	$ 8
Derivative, Fixed Interest Rate	2.443%	2.443%
RGC Midstream LLC [Member] | Unsecured Debt [Member] | Unsecured Term Notes Payable, at 3.58%, Due on October 2, 2027 [Member]
Debt Instrument, Face Amount	$ 8
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR Plus 1.15% Due June 12, 2026 [Member]
Debt Instrument, Face Amount	$ 14
Derivative, Fixed Interest Rate	3.24%

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Face (par) amount of debt instrument at time of issuance.

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