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Note 2 - Revenue (Tables) | 9 Months Ended
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Jun. 30, 2025
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended June 30, 2025 |  |  | Three Months Ended June 30, 2024 |
|  | Gas utility |  |  | Non utility |  |  | Total operating revenues |  |  | Gas utility |  |  | Non utility |  |  | Total operating revenues |
Natural Gas (Billed and Unbilled): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 8,677,898 |  |  | $ | — |  |  | $ | 8,677,898 |  |  | $ | 7,333,332 |  |  | $ | — |  |  | $ | 7,333,332 |
Commercial |  |  | 6,284,281 |  |  |  | — |  |  |  | 6,284,281 |  |  |  | 4,706,086 |  |  |  | — |  |  |  | 4,706,086 |
Transportation and interruptible |  |  | 1,472,948 |  |  |  | — |  |  |  | 1,472,948 |  |  |  | 1,317,890 |  |  |  | — |  |  |  | 1,317,890 |
Other |  |  | 148,576 |  |  |  | 25,065 |  |  |  | 173,641 |  |  |  | 168,514 |  |  |  | 26,823 |  |  |  | 195,337 |
Total contracts with customers |  |  | 16,583,703 |  |  |  | 25,065 |  |  |  | 16,608,768 |  |  |  | 13,525,822 |  |  |  | 26,823 |  |  |  | 13,552,645 |
Alternative revenue programs |  |  | 655,847 |  |  |  | — |  |  |  | 655,847 |  |  |  | 905,557 |  |  |  | — |  |  |  | 905,557 |
Total operating revenues |  | $ | 17,239,550 |  |  | $ | 25,065 |  |  | $ | 17,264,615 |  |  | $ | 14,431,379 |  |  | $ | 26,823 |  |  | $ | 14,458,202 |
|  | Nine Months Ended June 30, 2025 |  |  | Nine Months Ended June 30, 2024 |
|  | Gas utility |  |  | Non utility |  |  | Total operating revenues |  |  | Gas utility |  |  | Non utility |  |  | Total operating revenues |
Natural Gas (Billed and Unbilled): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 47,091,604 |  |  | $ | — |  |  | $ | 47,091,604 |  |  | $ | 40,001,039 |  |  | $ | — |  |  | $ | 40,001,039 |
Commercial |  |  | 27,740,237 |  |  |  | — |  |  |  | 27,740,237 |  |  |  | 22,946,163 |  |  |  | — |  |  |  | 22,946,163 |
Transportation and interruptible |  |  | 4,454,693 |  |  |  | — |  |  |  | 4,454,693 |  |  |  | 4,047,151 |  |  |  | — |  |  |  | 4,047,151 |
Other |  |  | 547,686 |  |  |  | 77,508 |  |  |  | 625,194 |  |  |  | 653,571 |  |  |  | 81,366 |  |  |  | 734,937 |
Total contracts with customers |  |  | 79,834,220 |  |  |  | 77,508 |  |  |  | 79,911,728 |  |  |  | 67,647,924 |  |  |  | 81,366 |  |  |  | 67,729,290 |
Alternative revenue programs |  |  | 1,104,470 |  |  |  | — |  |  |  | 1,104,470 |  |  |  | 3,807,640 |  |  |  | — |  |  |  | 3,807,640 |
Total operating revenues |  | $ | 80,938,690 |  |  | $ | 77,508 |  |  | $ | 81,016,198 |  |  | $ | 71,455,564 |  |  | $ | 81,366 |  |  | $ | 71,536,930 |
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] |
|  | Current Assets |  |  | Current Liabilities |
|  | Trade accounts receivable(1) |  |  | Unbilled revenue(1) |  |  | Customer credit balances |  |  | Customer deposits |
Balance at September 30, 2024 |  | $ | 3,080,140 |  |  | $ | 1,294,798 |  |  | $ | 1,915,859 |  |  | $ | 1,488,113 |
Balance at June 30, 2025 |  |  | 4,723,496 |  |  |  | 1,341,438 |  |  |  | 1,013,910 |  |  |  | 1,492,550 |
Increase (decrease) |  | $ | 1,643,356 |  |  | $ | 46,640 |  |  | $ | (901,949 | ) |  | $ | 4,437 |

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