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Note 6 - Derivatives and Hedging (Details Textual) $ in Millions	Dec. 31, 2021	Nov. 01, 2021 USD ($)	Sep. 24, 2021 USD ($)	Aug. 20, 2021 USD ($)	Jun. 30, 2019 USD ($)
Number of Interest Rate Derivatives Held	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 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%
RGC Midstream LLC [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] | 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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