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Note 7 - Long-term Debt - Long-term Debt (Details) - USD ($)	Dec. 31, 2021	Sep. 30, 2021
Notes payable	$ 153,645,607	$ 140,739,097
Unamortized Debt Issuance Costs	295,713	267,670
Notes payable	153,645,607	140,739,097
Total long-term debt, net current maturities	125,105,407	133,739,097
Notes Payable [Member]
Unamortized Debt Issuance Costs	295,713	267,670
Less: current maturities of long-term debt	(28,540,200)	(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	123,089	125,502
Notes payable	30,500,000	30,500,000
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
Notes payable	0	7,000,000
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	27,692	28,896
Notes payable	8,000,000	8,000,000
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	28,976	29,760
Notes payable	10,000,000	10,000,000
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	28,182	29,062
Notes payable	10,000,000	10,000,000
Roanoke Gas Company [Member] | Unsecured Term Notes [Member] | Unsecured Term Note Payable, at 30-day SOFR Plus 1.20%, Due August 20, 2026 [Member]
Notes payable	15,000,000	0
Unamortized Debt Issuance Costs	0
Notes payable	15,000,000	0
Roanoke Gas Company [Member] | Notes Payable [Member]
Notes payable	0	0
Unamortized Debt Issuance Costs	32,258	21,545
Notes payable	0	0
Roanoke Gas Company [Member] | Line of Credit [Member] | Line of Credit, at 30-day LIBOR Plus 1.00%, Due March 31, 2023 [Member]
Line-of-credit	19,605,407	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]
Notes payable	28,540,200	33,610,200
Unamortized Debt Issuance Costs	11,923	14,904
Notes payable	28,540,200	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]
Notes payable	14,000,000	14,000,000
Unamortized Debt Issuance Costs	10,835	11,437
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]
Notes payable	10,000,000	10,000,000
Unamortized Debt Issuance Costs	5,697	6,286
Notes payable	10,000,000	10,000,000
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Term Note Payable, at 30-day LIBOR Plus 1.50%, Due January 1, 2028 [Member]
Notes payable	8,000,000	0
Unamortized Debt Issuance Costs	27,061
Notes payable	8,000,000	0
RGC Midstream LLC [Member] | Notes Payable [Member]
Notes payable	134,040,200	123,110,200
Unamortized Debt Issuance Costs	295,713	267,670
Notes payable	$ 134,040,200	$ 123,110,200

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