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Note 7 - Long-term Debt (Details Textual) - USD ($)					12 Months Ended
	Sep. 05, 2025	May 02, 2024	Mar. 06, 2024	Jul. 28, 2023	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2025	Mar. 31, 2024	Apr. 03, 2023	Mar. 24, 2023	Aug. 20, 2021
Line of Credit Facility, Maximum Borrowing Capacity					$ 20,000,000	$ 20,000,000	$ 30,000,000			$ 20,000,000
Debt Instruments, Overall Maximum Borrowing Capacity			$ 25,000,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage					0.25%	0.15%
Unsecured Debt					$ 137,104,215	$ 137,755,000
Regulatory Asset					$ 5,897,920	9,548,954
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
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) [Member]
Deferred Gain (Loss) on Early Extinguishment of Debt [Member]
Regulatory Asset					$ 1,027,684	$ 1,141,872
Regulatory Asset, Amortization Period (Year)					20 years
Line of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 9,000,000
RGC Midstream LLC [Member] | Line of Credit [Member]
Debt Instrument, Basis Spread on Variable Rate		2.215%
Line of Credit Facility, Upfront Fee Percentage		0.40%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.125%
Two Interest Rate Swaps [Member]
Derivative, Notional Amount	$ 35,600,000
Derivative, Fixed Interest Rate	5.061%
Two Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member]
Derivative, Notional Amount	$ 53,600,000
New Term Note 1 [Member]
Debt Instrument, Face Amount	38,600,000
New Term Note 2 [Member]
Debt Instrument, Face Amount	$ 15,000,000
New Term Notes [Member]
Debt Instrument, Basis Spread on Variable Rate	1.55%
Debt Instrument, Origination Fee, Percentage	0.30%
Debt Instrument, Annual Fee	0.10%
MVP Southgate Note 1 [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,850,000
MVP Boost Note [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 3,650,000
MVP Southgate Notes [Member]
Debt Instrument, Basis Spread on Variable Rate	1.75%
Debt Instrument, Origination Fee, Percentage	0.25%
MVP Southgate Notes [Member] | Interest Rate Upon Meeting Milestones [Member]
Debt Instrument, Basis Spread on Variable Rate	1.55%
Unsecured Promissory Notes [Member] | RGC Midstream LLC [Member]
Debt Instrument, Basis Spread on Variable Rate			2.00%	2.00%
Unsecured Promissory Notes [Member] | Variable Rate Upon Meeting Milestones One [Member] | RGC Midstream LLC [Member]
Debt Instrument, Basis Spread on Variable Rate			1.75%
Unsecured Promissory Notes [Member] | Variable Rate Upon Meeting Milestones Two [Member] | RGC Midstream LLC [Member]
Debt Instrument, Basis Spread on Variable Rate			1.55%
Unsecured Term Note Payable, at 30-day LIBOR Plus 1.20%, Due June 1, 2024 [Member] | RGC Midstream LLC [Member] | Unsecured Term Notes [Member]
Unsecured Debt								$ 9,000,000
Unsecured Term Notes Payable, at 30-day SOFR Average 1.20% Due August 20, 2026 [Member]
Debt Instrument, Face Amount											$ 15,000,000
Amended and Restated Delayed Term Note Entered September 24, 2021 [Member]
Debt Instrument, Face Amount									$ 10,000,000
Subsequent Letter of Commitment to Refinance [Member]
Debt Instrument, Face Amount					$ 53,600,000
Subsequent Letter of Commitment to Refinance [Member] | RGC Midstream LLC [Member] | Unsecured Term Notes [Member]
Debt Instrument, Face Amount					53,600,000
One Point Eight Five Note [Member]
Debt Instrument, Face Amount					1,850,000
Three Point Six Five Note [Member]
Debt Instrument, Face Amount					3,650,000
Roanoke Gas Term Note [Member] | Roanoke Gas Company [Member]
Debt Instrument, Face Amount					$ 15,000,000

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