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Note 8 - Derivatives and Hedging (Details Textual) $ in Millions | Jun. 30, 2025 USD ($) | Mar. 06, 2024 USD ($) | 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] | Unsecured Debt [Member] |  |  |
Debt Instrument, Face Amount | $ 8 | $ 8 |
Derivative, Fixed Interest Rate | 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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