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Note 7 - Long-term Debt (Tables) | 6 Months Ended
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Mar. 31, 2024
Notes Tables |
Schedule of Long-Term Debt Instruments [Table Text Block] |
|  | March 31, 2024 |  |  | September 30, 2023 |
|  | 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 |  |  | $ | 101,368 |  |  | $ | 30,500,000 |  |  | $ | 106,195 |
Unsecured term notes payable at 3.58%, due October 2, 2027 |  |  | 8,000,000 |  |  |  | 16,856 |  |  |  | 8,000,000 |  |  |  | 19,264 |
Unsecured term notes payable at 4.41%, due March 28, 2031 |  |  | 10,000,000 |  |  |  | 21,928 |  |  |  | 10,000,000 |  |  |  | 23,495 |
Unsecured term notes payable at 3.60%, due December 6, 2029 |  |  | 10,000,000 |  |  |  | 20,256 |  |  |  | 10,000,000 |  |  |  | 22,017 |
Unsecured term note payable at 30-day SOFR plus 1.20%, due August 20, 2026 (swap rate at 2.00%) |  |  | 15,000,000 |  |  |  | — |  |  |  | 15,000,000 |  |  |  | — |
Unsecured term note payable at Term SOFR plus 1.00%, due October 1, 2028 (swap rate at 2.49%) |  |  | 10,000,000 |  |  |  | 30,300 |  |  |  | 10,000,000 |  |  |  | 33,666 |
Midstream: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured term notes payable at Term SOFR plus 2.00%, due December 31, 2025 |  |  | 23,275,000 |  |  |  | 45,218 |  |  |  | 23,000,000 |  |  |  | 23,386 |
Unsecured term note payable at Daily Simple SOFR plus 1.26448%, due June 12, 2026 (swap rate at 3.24%) |  |  | 14,000,000 |  |  |  | 5,417 |  |  |  | 14,000,000 |  |  |  | 6,621 |
Unsecured term note payable at 30-day LIBOR plus 1.20%, due June 1, 2024 with monthly principal installments of $41,667 that began July 1, 2022 (swap rate at 3.14%) |  |  | 9,125,000 |  |  |  | — |  |  |  | 9,375,000 |  |  |  | 1,571 |
Unsecured term note payable at Daily Simple SOFR plus 1.26448%, due January 1, 2028 with quarterly principal installments of $400,000 that began April 1, 2023, were suspended April 1, 2024, and will resume April 1, 2025 (swap rate at 2.443% on designated principal) |  |  | 6,400,000 |  |  |  | 16,770 |  |  |  | 7,200,000 |  |  |  | 19,057 |
Total long-term debt |  |  | 136,300,000 |  |  |  | 258,113 |  |  |  | 137,075,000 |  |  |  | 255,272 |
Less: current maturities of long-term debt |  |  | (125,000 | ) |  |  | — |  |  |  | (10,975,000 | ) |  |  | — |
Total long-term debt, net current maturities |  | $ | 136,175,000 |  |  | $ | 258,113 |  |  | $ | 126,100,000 |  |  | $ | 255,272 |

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