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Note 7 - Long-term Debt (Details Textual) - USD ($) $ in Millions						3 Months Ended
	Oct. 01, 2022	Apr. 01, 2022	Nov. 01, 2021	Sep. 24, 2021	Aug. 20, 2021	Dec. 31, 2021	Oct. 29, 2021	Oct. 28, 2021
Debt Instruments, Overall Maximum Borrowing Capacity			$ 33					$ 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%
Unsecured Promissory Note with 30 Day LIBOR Plus 115 Basis Points Maturing December 1, 2027 [Member] | RGC Midstream LLC [Member]
Debt Instrument, Face Amount			$ 8
Derivative, Fixed Interest Rate							2.443%
Unsecured Promissory Note with 30 Day LIBOR Plus 115 Basis Points Maturing December 1, 2027 [Member] | RGC Midstream LLC [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate			1.15%
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] | 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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- Definition

The maximum debt covenant ratio of long-term debt to total capitalization of a debt instrument.

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The maximum debt covenant ratio of priority debt to total assets of a debt instrument.

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

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Fixed interest rate related to the interest rate derivative.

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Nominal or face amount used to calculate payment on derivative.

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