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Note 7 - Long-Term Debt (Tables) | 3 Months Ended
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Dec. 31, 2024
Notes Tables |
Schedule of Long-Term Debt Instruments [Table Text Block] |
|  | December 31, 2024 |  |  | September 30, 2024 |
|  | Principal |  |  | Unamortized Debt Issuance Costs |  |  | Principal |  |  | Unamortized Debt Issuance Costs |
Roanoke Gas: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured senior note payable at 4.26%, due September 18, 2034 |  | $ | 30,500,000 |  |  | $ | 94,127 |  |  | $ | 30,500,000 |  |  | $ | 96,541 |
Unsecured term note payable at 3.58%, due October 2, 2027 |  |  | 8,000,000 |  |  |  | 13,244 |  |  |  | 8,000,000 |  |  |  | 14,448 |
Unsecured term note payable at 4.41%, due March 28, 2031 |  |  | 10,000,000 |  |  |  | 19,579 |  |  |  | 10,000,000 |  |  |  | 20,362 |
Unsecured term note payable at 3.60%, due December 6, 2029 |  |  | 10,000,000 |  |  |  | 17,614 |  |  |  | 10,000,000 |  |  |  | 18,494 |
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 |  |  |  | 25,305 |  |  |  | 10,000,000 |  |  |  | 27,044 |
Midstream: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured term note payable at Term SOFR plus 1.75% (1.55% beginning November 1, 2024), due December 31, 2025 |  |  | 25,000,000 |  |  |  | 25,839 |  |  |  | 24,855,000 |  |  |  | 32,299 |
Unsecured term note payable at Daily Simple SOFR plus 1.26448%, due January 1, 2028 (swap rate at 2.44%) |  |  | 14,000,000 |  |  |  | 3,611 |  |  |  | 14,000,000 |  |  |  | 4,213 |
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 |  |  |  | 19,730 |  |  |  | 6,400,000 |  |  |  | 21,406 |
Revolving credit facility at Daily Simple SOFR plus 2.215%, due May 2, 2026 |  |  | 8,895,000 |  |  |  | 39,819 |  |  |  | 9,000,000 |  |  |  | 47,285 |
Total long-term debt |  |  | 137,795,000 |  |  |  | 258,868 |  |  |  | 137,755,000 |  |  |  | 282,092 |
Less: current maturities of long-term debt |  |  | (26,200,000 | ) |  |  | — |  |  |  | (800,000 | ) |  |  | — |
Total long-term debt, net current maturities |  | $ | 111,595,000 |  |  | $ | 258,868 |  |  | $ | 136,955,000 |  |  | $ | 282,092 |

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