| Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
| | | Fair Value Measurements - June 30, 2026 | |
| | | | | | | Quoted | | | Significant | | | | | |
| | | | | | | Prices | | | Other | | | Significant | |
| | | | | | | in Active | | | Observable | | | Unobservable | |
| | | Fair | | | Markets | | | Inputs | | | Inputs | |
| | | Value | | | (Level 1) | | | (Level 2) | | | (Level 3) | |
| Assets: | | | | | | | | | | | | | | | | |
| Interest rate swaps - current | | $ | 550,336 | | | $ | — | | | $ | 550,336 | | | $ | — | |
| Interest rate swaps - noncurrent | | | 823,192 | | | | — | | | | 823,192 | | | | — | |
| Total | | $ | 1,373,528 | | | $ | — | | | $ | 1,373,528 | | | $ | — | |
| | | | | | | | | | | | | | | | | |
| Liabilities: | | | | | | | | | | | | | | | | |
| Natural gas purchases | | $ | 893,886 | | | $ | — | | | $ | 893,886 | | | $ | — | |
| Interest rate swaps - current | | | 35,735 | | | | | | | | 35,735 | | | | — | |
| Interest rate swaps - noncurrent | | | 77,427 | | | | | | | | 77,427 | | | | — | |
| Total | | $ | 1,007,048 | | | $ | — | | | $ | 1,007,048 | | | $ | — | |
| | | Fair Value Measurements - September 30, 2025 | |
| | | | | | | Quoted | | | Significant | | | | | |
| | | | | | | Prices | | | Other | | | Significant | |
| | | | | | | in Active | | | Observable | | | Unobservable | |
| | | Fair | | | Markets | | | Inputs | | | Inputs | |
| | | Value | | | (Level 1) | | | (Level 2) | | | (Level 3) | |
| Assets: | | | | | | | | | | | | | | | | |
| Interest rate swaps - current | | $ | 828,573 | | | $ | — | | | $ | 828,573 | | | $ | — | |
| Interest rate swaps - noncurrent | | | 421,511 | | | | — | | | | 421,511 | | | | — | |
| Total | | $ | 1,250,084 | | | $ | — | | | $ | 1,250,084 | | | $ | — | |
| | | | | | | | | | | | | | | | | |
| Liabilities: | | | | | | | | | | | | | | | | |
| Natural gas purchases | | $ | 135,863 | | | $ | — | | | $ | 135,863 | | | $ | — | |
| Interest rate swaps - current | | | 57,144 | | | | — | | | | 57,144 | | | | — | |
| Interest rate swaps - noncurrent | | | 298,016 | | | | — | | | | 298,016 | | | | — | |
| Total | | $ | 491,023 | | | $ | — | | | $ | 491,023 | | | $ | — | |
|
| Fair Value, by Balance Sheet Grouping [Table Text Block] |
| | | Fair Value Measurements - June 30, 2026 | |
| | | | | | | Quoted | | | Significant | | | | | |
| | | | | | | Prices | | | Other | | | Significant | |
| | | | | | | in Active | | | Observable | | | Unobservable | |
| | | Carrying | | | Markets | | | Inputs | | | Inputs | |
| | | Value | | | (Level 1) | | | (Level 2) | | | (Level 3) | |
| Liabilities: | | | | | | | | | | | | | | | | |
| Current maturities of long-term debt | | $ | 2,846,018 | | | $ | — | | | $ | — | | | $ | 2,846,018 | |
| Notes payable | | | 133,139,644 | | | | — | | | | — | | | | 129,908,205 | |
| Total | | $ | 135,985,662 | | | $ | — | | | $ | — | | | $ | 132,754,223 | |
| | | Fair Value Measurements - September 30, 2025 | |
| | | | | | | Quoted | | | Significant | | | | | |
| | | | | | | Prices | | | Other | | | Significant | |
| | | | | | | in Active | | | Observable | | | Unobservable | |
| | | Carrying | | | Markets | | | Inputs | | | Inputs | |
| | | Value | | | (Level 1) | | | (Level 2) | | | (Level 3) | |
| Liabilities: | | | | | | | | | | | | | | | | |
| Current maturities of long-term debt | | $ | 2,846,018 | | | $ | — | | | $ | — | | | $ | 2,846,018 | |
| Notes payable | | | 134,258,197 | | | | — | | | | — | | | | 131,605,756 | |
| Total | | $ | 137,104,215 | | | $ | — | | | $ | — | | | $ | 134,451,774 | |
|