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Note 9 - Long-term Debt - Long-term Debt (Details) - USD ($)	Mar. 31, 2022	Sep. 30, 2021
Notes payable	$ 124,830,200	$ 140,739,097
Unamortized Debt Issuance Costs	283,922	267,670
Long-Term Line of Credit, Total	0
Total long-term debt, net current maturities	105,125,000	133,739,097
Notes Payable [Member]
Less: current maturities of long-term debt	(19,705,200)	(7,000,000)
Roanoke Gas Company [Member] | Unsecured Senior Notes Payable [Member] | Unsecured Senior Notes Payable, at 4.26%, Due on September 18, 2034 [Member]
Notes payable	30,500,000	30,500,000
Unamortized Debt Issuance Costs	120,676	125,502
Roanoke Gas Company [Member] | Unsecured Term Notes [Member] | Unsecured Term Note Payable, at 30-day LIBOR Plus 0.90%, Due November 1, 2021 [Member]
Notes payable	0	7,000,000
Unamortized Debt Issuance Costs	0	278
Roanoke Gas Company [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 3.58%, Due on October 2, 2027 [Member]
Notes payable	8,000,000	8,000,000
Unamortized Debt Issuance Costs	26,488	28,896
Roanoke Gas Company [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 4.41 %, Due on March 28, 2031 [Member]
Notes payable	10,000,000	10,000,000
Unamortized Debt Issuance Costs	28,193	29,760
Roanoke Gas Company [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 3.60%, Due on December 6, 2029 [Member]
Notes payable	10,000,000	10,000,000
Unamortized Debt Issuance Costs	27,301	29,062
Roanoke Gas Company [Member] | Unsecured Term Notes [Member] | Unsecured Term Note Payable, at 30-day SOFR Plus 1.20%, Due August 20, 2026 [Member]
Unamortized Debt Issuance Costs	0
Roanoke Gas Company [Member] | Unsecured Term Notes [Member] | Unsecured Term Note Payable, at 30-day SOFR Plus 1.20%, Due August 20, 2026 [Member] | Secured Overnight Financing Rate (SOFR) [Member]
Notes payable	15,000,000	0
Roanoke Gas Company [Member] | Notes Payable [Member]
Notes payable	0	0
Unamortized Debt Issuance Costs	31,064	21,545
Roanoke Gas Company [Member] | Line of Credit [Member] | Line of Credit, at 30-day LIBOR Plus 1.00%, Due March 31, 2023 [Member]
Long-Term Line of Credit, Total	0	17,628,897
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR Plus 1.35%, Due December 29,2022 [Member]
Unamortized Debt Issuance Costs	8,942	14,904
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR Plus 1.35%, Due December 29,2022 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Notes payable	19,330,200	33,610,200
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Term Note Payable, at 30-day LIBOR Plus 1.15%, Due June 12, 2026 [Member]
Unamortized Debt Issuance Costs	10,233	11,437
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Term Note Payable, at 30-day LIBOR Plus 1.15%, Due June 12, 2026 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Notes payable	14,000,000	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]
Unamortized Debt Issuance Costs	5,107	6,286
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Term Note Payable, at 30-day LIBOR Plus 1.20%, Due June 1, 2024 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Notes payable	10,000,000	10,000,000
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Promissory Note with 30 Day LIBOR Plus 1.15 Basis Points Maturing January 1, 2028 [Member]
Unamortized Debt Issuance Costs	25,918
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Promissory Note with 30 Day LIBOR Plus 1.15 Basis Points Maturing January 1, 2028 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Notes payable	8,000,000	0
RGC Midstream LLC [Member] | Notes Payable [Member]
Notes payable	124,830,200	123,110,200
Unamortized Debt Issuance Costs	$ 283,922	$ 267,670

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