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Note 7 - Long-term Debt (Details Textual) - USD ($)						6 Months Ended
	May 02, 2024	Mar. 06, 2024	Jul. 28, 2023	Jun. 28, 2023	Mar. 24, 2023	Mar. 31, 2024	Sep. 30, 2023	Apr. 03, 2023	Aug. 20, 2021
Debt Instruments, Overall Maximum Borrowing Capacity		$ 25,000,000
Regulatory Asset						$ 10,316,730	$ 8,243,721
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						$ 1,198,965	$ 1,256,059
Regulatory Asset, Amortization Period (Year)						20 years
Subsequent Event [Member] | Line of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 9,000,000
Amended and Restated Delayed Term Note Entered September 24, 2021 [Member]
Debt Instrument, Face Amount								$ 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 Debt [Member]
Debt Instrument, Face Amount				$ 8,000,000		$ 8,000,000
Derivative, Fixed Interest Rate				2.443%		2.443%
RGC Midstream LLC [Member] | Subsequent Event [Member] | Line of Credit [Member]
Line of Credit Facility, Upfront Fee Percentage	0.40%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.125%
RGC Midstream LLC [Member] | Secured Overnight Financing Rate (SOFR) [Member] | Unsecured Debt [Member]
Debt Instrument, Basis Spread on Variable Rate				1.26448%
RGC Midstream LLC [Member] | Secured Overnight Financing Rate (SOFR) [Member] | Subsequent Event [Member] | Line of Credit [Member]
Debt Instrument, Basis Spread on Variable Rate	2.215%
RGC Midstream LLC [Member] | London Interbank Offered Rate (LIBOR) 1 [Member] | Unsecured Debt [Member]
Debt Instrument, Basis Spread on Variable Rate				1.15%
RGC Midstream LLC [Member] | Unsecured Promissory Notes [Member] | Secured Overnight Financing Rate (SOFR) [Member]
Debt Instrument, Basis Spread on Variable Rate		2.00%	2.00%
RGC Midstream LLC [Member] | Unsecured Promissory Notes [Member] | Secured Overnight Financing Rate (SOFR) [Member] | Variable Rate Upon Meeting Milestones One [Member]
Debt Instrument, Basis Spread on Variable Rate		1.75%
RGC Midstream LLC [Member] | Unsecured Promissory Notes [Member] | Secured Overnight Financing Rate (SOFR) [Member] | Variable Rate Upon Meeting Milestones Two [Member]
Debt Instrument, Basis Spread on Variable Rate		1.55%
RGC Midstream LLC [Member] | Unsecured Term Note Payable, at 30-day LIBOR Plus 1.20%, Due June 1, 2024 [Member] | Unsecured Term Notes [Member]
Unsecured Debt						$ 9,000,000
RGC Midstream LLC [Member] | Unsecured term note payable, at Daily Simple SOFR plus 1.26448%, due June 12, 2026[Member] | Unsecured Term Notes [Member]
Debt Instrument, Face Amount				$ 14,000,000
Derivative, Fixed Interest Rate				3.24%
Roanoke Gas Company [Member] | Amended and Restated Delayed Term Note Entered September 24, 2021 [Member]
Debt Instrument, Basis Spread on Variable Rate					1.00%
Debt Instrument, Face Amount					$ 10,000,000
Roanoke Gas Company [Member] | Amended and Restated Delayed Term Note Entered September 24, 2021 [Member] | Secured Overnight Financing Rate (SOFR) [Member]
Debt Instrument, Basis Spread on Variable Rate					1.00%
Roanoke Gas Company [Member] | Unsecured Term Notes Payable, at 30-day SOFR Average 1.20% Due August 20, 2026 [Member] | Unsecured Debt [Member]
Debt Instrument, Face Amount						$ 15,000,000
Derivative, Fixed Interest Rate						2.00%

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Fixed interest rate related to the interest rate derivative.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amortization period for the recovery of regulatory asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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