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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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