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Note 2 - Revenue (Tables) | 9 Months Ended
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Jun. 30, 2024
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended June 30, 2024 |  |  | Three Months Ended June 30, 2023 |
|  | Gas utility |  |  | Non utility |  |  | Total operating revenues |  |  | Gas utility |  |  | Non utility |  |  | Total operating revenues |
Natural Gas (Billed and Unbilled): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 7,333,332 |  |  | $ | — |  |  | $ | 7,333,332 |  |  | $ | 7,405,959 |  |  | $ | — |  |  | $ | 7,405,959 |
Commercial |  |  | 4,706,086 |  |  |  | — |  |  |  | 4,706,086 |  |  |  | 4,459,667 |  |  |  | — |  |  |  | 4,459,667 |
Transportation and interruptible |  |  | 1,317,890 |  |  |  | — |  |  |  | 1,317,890 |  |  |  | 1,354,678 |  |  |  | — |  |  |  | 1,354,678 |
Other |  |  | 168,514 |  |  |  | 26,823 |  |  |  | 195,337 |  |  |  | 170,160 |  |  |  | 28,389 |  |  |  | 198,549 |
Total contracts with customers |  |  | 13,525,822 |  |  |  | 26,823 |  |  |  | 13,552,645 |  |  |  | 13,390,464 |  |  |  | 28,389 |  |  |  | 13,418,853 |
Alternative revenue programs |  |  | 905,557 |  |  |  | — |  |  |  | 905,557 |  |  |  | 241,392 |  |  |  | — |  |  |  | 241,392 |
Total operating revenues |  | $ | 14,431,379 |  |  | $ | 26,823 |  |  | $ | 14,458,202 |  |  | $ | 13,631,856 |  |  | $ | 28,389 |  |  | $ | 13,660,245 |
|  | Nine Months Ended June 30, 2024 |  |  | Nine Months Ended June 30, 2023 |
|  | Gas utility |  |  | Non utility |  |  | Total operating revenues |  |  | Gas utility |  |  | Non utility |  |  | Total operating revenues |
Natural Gas (Billed and Unbilled): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 40,001,039 |  |  | $ | — |  |  | $ | 40,001,039 |  |  | $ | 48,148,235 |  |  | $ | — |  |  | $ | 48,148,235 |
Commercial |  |  | 22,946,163 |  |  |  | — |  |  |  | 22,946,163 |  |  |  | 28,502,754 |  |  |  | — |  |  |  | 28,502,754 |
Transportation and interruptible |  |  | 4,047,151 |  |  |  | — |  |  |  | 4,047,151 |  |  |  | 4,508,997 |  |  |  | — |  |  |  | 4,508,997 |
Other |  |  | 653,571 |  |  |  | 81,366 |  |  |  | 734,937 |  |  |  | 855,079 |  |  |  | 86,637 |  |  |  | 941,716 |
Total contracts with customers |  |  | 67,647,924 |  |  |  | 81,366 |  |  |  | 67,729,290 |  |  |  | 82,015,065 |  |  |  | 86,637 |  |  |  | 82,101,702 |
Alternative revenue programs |  |  | 3,807,640 |  |  |  | — |  |  |  | 3,807,640 |  |  |  | 2,870,535 |  |  |  | — |  |  |  | 2,870,535 |
Total operating revenues |  | $ | 71,455,564 |  |  | $ | 81,366 |  |  | $ | 71,536,930 |  |  | $ | 84,885,600 |  |  | $ | 86,637 |  |  | $ | 84,972,237 |
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, 2023 |  | $ | 2,782,025 |  |  | $ | 1,240,097 |  |  | $ | 1,972,132 |  |  | $ | 1,476,321 |
Balance at June 30, 2024 |  |  | 3,783,662 |  |  |  | 1,423,346 |  |  |  | 1,075,453 |  |  |  | 1,586,618 |
Increase (decrease) |  | $ | 1,001,637 |  |  | $ | 183,249 |  |  | $ | (896,679 | ) |  | $ | 110,297 |

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