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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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