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Note 7 - Long-term Debt (Tables) | 3 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule of Long-term Debt Instruments [Table Text Block] |
|  | December 31, 2021 |  |  | September 30, 2021 |
|  | Principal |  |  | Unamortized Debt Issuance Costs |  |  | Principal |  |  | Unamortized Debt Issuance Costs |
Roanoke Gas: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes payable, at 4.26%, due September 18, 2034 |  | $ | 30,500,000 |  |  | $ | 123,089 |  |  | $ | 30,500,000 |  |  | $ | 125,502 |
Unsecured term note payable, at 30-day LIBOR plus 0.90%, due November 1, 2021 |  |  | — |  |  |  | — |  |  |  | 7,000,000 |  |  |  | 278 |
Unsecured term notes payable, at 3.58%, due October 2, 2027 |  |  | 8,000,000 |  |  |  | 27,692 |  |  |  | 8,000,000 |  |  |  | 28,896 |
Unsecured term notes payable, at 4.41%, due March 28, 2031 |  |  | 10,000,000 |  |  |  | 28,976 |  |  |  | 10,000,000 |  |  |  | 29,760 |
Unsecured term notes payable, at 3.60%, due December 6, 2029 |  |  | 10,000,000 |  |  |  | 28,182 |  |  |  | 10,000,000 |  |  |  | 29,062 |
Unsecured term note payable, at 30-day SOFR plus 1.20%, due August 20, 2026 |  |  | 15,000,000 |  |  |  | — |  |  |  | — |  |  |  | — |
Unsecured delayed draw note payable |  |  | — |  |  |  | 32,258 |  |  |  | — |  |  |  | 21,545 |
Midstream: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured term notes payable, at 30-day LIBOR plus 1.35%, due December 29, 2022 |  |  | 28,540,200 |  |  |  | 11,923 |  |  |  | 33,610,200 |  |  |  | 14,904 |
Unsecured term note payable, at 30-day LIBOR plus 1.15%, due June 12, 2026 |  |  | 14,000,000 |  |  |  | 10,835 |  |  |  | 14,000,000 |  |  |  | 11,437 |
Unsecured term note payable, at 30-day LIBOR plus 1.20%, due June 1, 2024 |  |  | 10,000,000 |  |  |  | 5,697 |  |  |  | 10,000,000 |  |  |  | 6,286 |
Unsecured term note payable, at 30-day LIBOR plus 1.15%, due January 1, 2028 |  |  | 8,000,000 |  |  |  | 27,061 |  |  |  | — |  |  |  | — |
Total notes payable, current and non-current |  |  | 134,040,200 |  |  |  | 295,713 |  |  |  | 123,110,200 |  |  |  | 267,670 |
Line-of-credit, at 30-day LIBOR plus 1.00%, due March 31, 2023 |  |  | 19,605,407 |  |  |  | — |  |  |  | 17,628,897 |  |  |  | — |
Total long-term debt |  |  | 153,645,607 |  |  |  | 295,713 |  |  |  | 140,739,097 |  |  |  | 267,670 |
Less: current maturities of long-term debt |  |  | (28,540,200 | ) |  |  | — |  |  |  | (7,000,000 | ) |  |  | — |
Total long-term debt, net current maturities |  | $ | 125,105,407 |  |  | $ | 295,713 |  |  | $ | 133,739,097 |  |  | $ | 267,670 |

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