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Note 7 - Long-term Debt (Details Textual) - USD ($)							12 Months Ended
	Jul. 28, 2023	Jun. 28, 2023	Jun. 27, 2023	Mar. 24, 2023	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Apr. 03, 2023	Sep. 30, 2022	Nov. 01, 2021	Aug. 20, 2021	Jun. 12, 2019
Debt Instruments, Overall Maximum Borrowing Capacity						$ 23,000,000				$ 33,000,000
Regulatory Asset							$ 9,079,693		$ 7,797,302
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
Deferred Gain (Loss) on Early Extinguishment of Debt [Member]
Regulatory Asset							$ 1,256,059		$ 1,370,246
Regulatory Asset, Amortization Period (Year)							20 years
Amended and Restated Delayed Term Note Entered September 24, 2021 [Member]
Debt Instrument, Face Amount								$ 10,000,000
Cash Infusion Proceeds Utilized to Repay Non-revolving Credit Facility [Member]
Repayments of Debt						$ 10,000,000
Unsecured Term Notes Payable, at 30-day SOFR Average 1.20% Due August 20, 2026 [Member]
Debt Instrument, Face Amount											$ 15,000,000
RGC Midstream LLC [Member]
Derivative, Fixed Interest Rate								2.49%
RGC Midstream LLC [Member] | Unsecured Promissory Notes [Member]
Debt Instrument, Basis Spread on Variable Rate					1.35%
RGC Midstream LLC [Member] | Unsecured Promissory Notes [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	2.00%				1.50%
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured term note payable, at Daily Simple SOFR plus 1.26448%, due June 12, 2026[Member]
Debt Instrument, Face Amount												$ 14,000,000
Derivative, Fixed Interest Rate		3.24%
RGC Midstream LLC [Member] | Unsecured Debt [Member]
Debt Instrument, Face Amount										$ 8,000,000
Derivative, Fixed Interest Rate		2.443%								2.443%
RGC Midstream LLC [Member] | Unsecured Debt [Member] | London Interbank Offered Rate (LIBOR) 1 [Member]
Debt Instrument, Basis Spread on Variable Rate			1.15%
RGC Midstream LLC [Member] | Unsecured Debt [Member] | Secured Overnight Financing Rate (SOFR) [Member]
Debt Instrument, Basis Spread on Variable Rate		1.26448%
Roanoke Gas Company [Member] | Amended and Restated Delayed Term Note Entered September 24, 2021 [Member]
Debt Instrument, Face Amount				$ 10,000,000
Debt Instrument, Basis Spread on Variable Rate				1.00%
Roanoke Gas Company [Member] | Amended and Restated Delayed Term Note Entered September 24, 2021 [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate				1.00%
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											$ 15,000,000
Derivative, Fixed Interest Rate											2.00%

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