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Note 1 - Summary of Significant Accounting Policies (Details Textual)			1 Months Ended	12 Months Ended
	Sep. 30, 2022 USD ($)	Apr. 01, 2022 USD ($)	Mar. 31, 2022 USD ($) shares	Sep. 30, 2023 USD ($) shares	Sep. 30, 2022 USD ($) shares	Jun. 28, 2023	Apr. 03, 2023	Nov. 01, 2021 USD ($)	Sep. 24, 2021 USD ($)	Aug. 20, 2021 USD ($)	Jun. 30, 2019 USD ($)
Number of Major Customers				62,200
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided				$ 8,600,046
Regulatory Utility Assets Provision, Period (Year)				5 years
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service				3.30%	3.28%
Allowance for Funds Used During Construction, Capitalized Interest				$ 76,785	$ 15,911
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity				285,900	59,243
Unbilled Receivables, Current	$ 1,585,062			$ 1,240,097	$ 1,585,062
Deferred Charges, Amortization Period (Month)				12 months
Stock Issued During Period, Shares, New Issues (in shares) \| shares				182,219	1,436,693
Proceeds from Issuance of Common Stock				$ 3,903,362	$ 28,984,957
Number of Pipelines				2
Unsecured Term Notes Payable, at 30-day SOFR Average 1.20% Due August 20, 2026 [Member]
Debt Instrument, Face Amount										$ 15,000,000
Roanoke Gas Company [Member] \| Unsecured Term Notes Payable, at 30-day LIBOR Plus 100 Basis Points, Due October 1, 2028 [Member]
Proceeds from Issuance of Long-Term Debt	$ 5,000,000	$ 5,000,000
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%
Roanoke Gas Company [Member] \| Unsecured Debt [Member] \| Unsecured Term Notes Payable, at 30-day LIBOR Plus 100 Basis Points, Due October 1, 2028 [Member]
Debt Instrument, Face Amount									$ 10,000,000
Derivative, Fixed Interest Rate									2.49%
RGC Midstream LLC [Member]
Derivative, Fixed Interest Rate							2.49%
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] \| Unsecured Term Note Payable, at 30-day LIBOR Plus 1.20%, Due June 1, 2024 [Member]
Derivative, Fixed Interest Rate											3.14%
RGC Midstream LLC [Member] \| Unsecured Debt [Member] \| Unsecured Term Note Payable, at 30-day LIBOR Plus 1.15%, Due June 12, 2026 [Member]
Derivative, Fixed Interest Rate											3.24%
RGC Midstream LLC [Member] \| Unsecured Term Notes [Member] \| Unsecured Term Notes Payable, at 30-day LIBOR Plus 1.15% Due June 12, 2026 [Member]
Debt Instrument, Face Amount											$ 14,000,000
RGC Midstream LLC [Member] \| Unsecured Term Notes [Member] \| Unsecured Term Note Payable, at 30-day LIBOR Plus 1.20%, Due June 1, 2024 [Member]
Debt Instrument, Face Amount											$ 10,000,000
Energy Related Derivative [Member]
Derivative, Number of Instruments Held	0			0	0
Interest Rate Swap [Member]
Derivative, Number of Instruments Held				5
Customer Concentration Risk [Member] \| Revenue from Contract with Customer Benchmark [Member]
Number of Major Customers				0
Customer Concentration Risk [Member] \| Revenue from Contract with Customer Benchmark [Member] \| Minimum [Member]
Concentration Risk, Percentage				5.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Number of Major Customers	1			0	1
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| One Customer [Member]
Concentration Risk, Percentage					5.10%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Minimum [Member]
Concentration Risk, Percentage				5.00%
DRIP, Restricted Stock, Stock Option Exercises and ATM Activity [Member]
Stock Issued During Period, Shares, New Issues (in shares) \| shares				194,719	95,443
Equity Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares) \| shares			1,350,000
Proceeds from Issuance of Common Stock			$ 27,000,000
Operations and Maintenance Expense [Member]
Amortization of Regulatory Asset				$ 213,450	$ 156,467
Other Income [Member]
Amortization of Regulatory Asset				237,911	206,679
Interest Expense [Member]
Amortization of Regulatory Asset				$ 114,187	$ 114,187