Note 13 - Regulatory Assets and Liabilities - Schedule of Regulatory Assets (Details) - USD ($) |
Jun. 30, 2026 |
Sep. 30, 2025 |
|---|---|---|
| Regulatory assets | $ 4,553,070 | $ 2,582,838 |
| Noncurrent regulatory assets | 5,291,256 | 3,315,082 |
| Total regulatory assets | 9,844,326 | 5,897,920 |
| WNA [Member] | ||
| Regulatory assets | 386,467 | 504,003 |
| Regulatory Clause Revenues, under-Recovered [Member] | ||
| Regulatory assets | 3,155,181 | 750,295 |
| Under-recovery of RNG Revenues [Member] | ||
| Regulatory assets | 865,413 | 1,019,821 |
| Under-recovery of SAVE Plan Revenues [Member] | ||
| Regulatory assets | 125,587 | 265,317 |
| Pension Costs [Member] | ||
| Regulatory assets | 7,660 | 30,640 |
| Noncurrent regulatory assets | 2,168,902 | 2,168,902 |
| Other Regulatory Assets (Liabilities) [Member] | ||
| Regulatory assets | 12,762 | 12,762 |
| Noncurrent regulatory assets | 86,373 | 118,496 |
| Deferred Gain (Loss) on Early Extinguishment of Debt [Member] | ||
| Noncurrent regulatory assets | 942,044 | 1,027,684 |
| Deferred LNG Facility Costs [Member] | ||
| Noncurrent regulatory assets | $ 2,093,937 | $ 0 |