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Note 7 - Long-term Debt (Tables) | 12 Months Ended
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Sep. 30, 2025
Notes Tables |
Schedule of Long-Term Debt Instruments [Table Text Block] |
|  | September 30 |
|  | 2025 |  |  | 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 |  |  | $ | 86,887 |  |  | $ | 30,500,000 |  |  | $ | 96,541 |
Unsecured term note payable at 3.58%, due October 2, 2027 |  |  | 8,000,000 |  |  |  | 9,632 |  |  |  | 8,000,000 |  |  |  | 14,448 |
Unsecured term note payable at 4.41%, due March 28, 2031 |  |  | 10,000,000 |  |  |  | 17,229 |  |  |  | 10,000,000 |  |  |  | 20,362 |
Unsecured term note payable at 3.60%, due December 6, 2029 |  |  | 10,000,000 |  |  |  | 14,971 |  |  |  | 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 |  |  |  | 22,612 |  |  |  | 10,000,000 |  |  |  | 27,044 |
Midstream: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured term note payable at Term SOFR plus 1.55%, due September 5, 2032 ($14M swap rate at 3.24%, $4M swap rate at 2.443%, and $20.6M swap rate at 5.061%) |  |  | 38,600,000 |  |  |  | 171,362 |  |  |  | — |  |  |  | — |
Unsecured term note payable at Term SOFR plus 1.55%, due September 5, 2032 (swap rate at 5.061%) |  |  | 15,000,000 |  |  |  | 66,592 |  |  |  | — |  |  |  | — |
Revolving credit facility at Term SOFR plus 1.75%, due September 5, 2030 ("Southgate") |  |  | 4,215 |  |  |  | 5,553 |  |  |  | — |  |  |  | — |
Revolving credit facility at Term SOFR plus 1.75%, due September 5, 2030 ("Boost") |  |  | — |  |  |  | 10,956 |  |  |  | — |  |  |  | — |
Unsecured term note payable at Term SOFR plus 1.55%, retired September 5, 2025 |  |  | — |  |  |  | — |  |  |  | 24,855,000 |  |  |  | 32,299 |
Unsecured term note payable at Daily Simple SOFR plus 1.26448% (swap rate at 3.24%), retired September 5, 2025 |  |  | — |  |  |  | — |  |  |  | 14,000,000 |  |  |  | 4,213 |
Unsecured term note payable at Daily Simple SOFR plus 1.26448% (swap rate at 2.443% on designated principal), retired September 5, 2025 |  |  | — |  |  |  | — |  |  |  | 6,400,000 |  |  |  | 21,406 |
Revolving credit facility at Daily Simple SOFR plus 2.215%, retired September 5, 2025 |  |  | — |  |  |  | — |  |  |  | 9,000,000 |  |  |  | 47,285 |
Total long-term debt |  | $ | 137,104,215 |  |  | $ | 405,794 |  |  | $ | 137,755,000 |  |  | $ | 282,092 |
Less: current maturities of long-term debt |  |  | (2,846,018 | ) |  |  | — |  |  |  | (800,000 | ) |  |  | — |
Total long-term debt, net current maturities |  | $ | 134,258,197 |  |  | $ | 405,794 |  |  | $ | 136,955,000 |  |  | $ | 282,092 |
Schedule of Maturities of Long-Term Debt [Table Text Block] |
Year Ending September 30 |  | Maturities |
2026 |  | $ | 17,846,018 |
2027 |  |  | 2,846,018 |
2028 |  |  | 10,846,017 |
2029 |  |  | 12,846,018 |
2030 |  |  | 12,850,233 |
Thereafter |  |  | 79,869,911 |
Total |  | $ | 137,104,215 |

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