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Note 7 - Long-term Debt (Details Textual)						6 Months Ended	9 Months Ended
	May 02, 2024 USD ($)	Mar. 06, 2024 USD ($)	Jul. 28, 2023	Jun. 28, 2023 USD ($)	Mar. 24, 2023 USD ($)	Mar. 31, 2024 USD ($)	Jun. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Apr. 03, 2023 USD ($)	Aug. 20, 2021 USD ($)
Debt Instruments, Overall Maximum Borrowing Capacity		$ 25,000,000
Unsecured Debt							$ 137,015,000	$ 137,075,000
Regulatory Asset							$ 8,795,500	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							$ 1,170,418	$ 1,256,059
Regulatory Asset, Amortization Period (Year)						20 years
Line of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 9,000,000						$ 9,000,000
Debt Instrument, Debt Covenant, Interest Coverage Ratio							1.5
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] | 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] | 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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