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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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