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Note 9 - Long-term Debt (Details Textual) - USD ($) $ in Millions |  |  |  |  |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2022 | Apr. 01, 2022 | Nov. 01, 2021 | Sep. 24, 2021 | Aug. 20, 2021 | Mar. 31, 2021 | Mar. 31, 2022 | Oct. 31, 2021
Debt Instruments, Overall Maximum Borrowing Capacity |  |  | $ 33 |  |  |  | $ 23 | $ 41
Debt Instrument, Debt Covenant Ratio of Long-term Debt to Total Capitalization, Maximum |  |  |  |  |  |  | 65.00% |
Debt Instrument, Debt Covenant, Ratio of Priority Debt to Total Assets, Maximum |  |  |  |  |  |  | 15.00% |
Debt Instrument, Debt Covenant, Interest Coverage Ratio |  |  |  |  |  |  | 1.5 |
Unsecured Promissory Note with 30 Day LIBOR Plus 1.15 Basis Points Maturing January 1, 2028 [Member] | RGC Midstream LLC [Member] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 8 |  |  |  |  |
Derivative, Fixed Interest Rate |  |  | 2.443% |  |  |  |  |
Unsecured Promissory Note with 30 Day LIBOR Plus 1.15 Basis Points Maturing January 1, 2028 [Member] | RGC Midstream LLC [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.15% |  |  |  |  |
Cash Infusion Proceeds Utilized to Repay Non-revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  |  | $ 10 |  |
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] | Roanoke Gas Company [Member] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 10 |  |  |  |
Unsecured Term Notes Payable, at 30-day LIBOR Plus 100 Basis Points, Due October 1, 2028 [Member] | Roanoke Gas Company [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |  |
Derivative, Fixed Interest Rate |  |  |  | 2.49% |  |  |  |
Derivative, Notional Amount |  |  |  | $ 10 |  |  |  |
Unsecured Term Notes Payable, at 30-day LIBOR Plus 100 Basis Points, Due October 1, 2028 [Member] | Roanoke Gas Company [Member] | Forecast [Member] |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt, Total | $ 5 | $ 5 |  |  |  |  |  |
Unsecured Term Notes Payable, at 30-day LIBOR Plus 100 Basis Points, Due October 1, 2028 [Member] | Roanoke Gas Company [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.00% |  |  |  |
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 SOFR Average 1.20% Due August 20, 2026 [Member] | Roanoke Gas Company [Member] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 15 |  |  |
Unsecured Term Notes Payable, at 30-day SOFR Average 1.20% Due August 20, 2026 [Member] | Roanoke Gas Company [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |  |
Derivative, Fixed Interest Rate |  |  |  |  | 2.00% |  |  |
Derivative, Notional Amount |  |  |  |  | $ 15 |  |  |
Unsecured Term Notes Payable, at 30-day SOFR Average 1.20% Due August 20, 2026 [Member] | Roanoke Gas Company [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 1.20% |  |  |

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