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Note 2 - Revenue (Tables) | 6 Months Ended
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Mar. 31, 2024
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended March 31, 2024 |  |  | Three Months Ended March 31, 2023 |
|  | Gas utility |  |  | Non utility |  |  | Total operating revenues |  |  | Gas utility |  |  | Non utility |  |  | Total operating revenues |
Natural Gas (Billed and Unbilled): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 18,843,065 |  |  | $ | — |  |  | $ | 18,843,065 |  |  | $ | 21,376,436 |  |  | $ | — |  |  | $ | 21,376,436 |
Commercial |  |  | 10,398,801 |  |  |  | — |  |  |  | 10,398,801 |  |  |  | 12,025,056 |  |  |  | — |  |  |  | 12,025,056 |
Transportation and interruptible |  |  | 1,358,991 |  |  |  | — |  |  |  | 1,358,991 |  |  |  | 1,565,170 |  |  |  | — |  |  |  | 1,565,170 |
Other |  |  | 190,719 |  |  |  | 27,045 |  |  |  | 217,764 |  |  |  | 262,923 |  |  |  | 28,680 |  |  |  | 291,603 |
Total contracts with customers |  |  | 30,791,576 |  |  |  | 27,045 |  |  |  | 30,818,621 |  |  |  | 35,229,585 |  |  |  | 28,680 |  |  |  | 35,258,265 |
Alternative revenue programs |  |  | 1,840,755 |  |  |  | — |  |  |  | 1,840,755 |  |  |  | 2,771,392 |  |  |  | — |  |  |  | 2,771,392 |
Total operating revenues |  | $ | 32,632,331 |  |  | $ | 27,045 |  |  | $ | 32,659,376 |  |  | $ | 38,000,977 |  |  | $ | 28,680 |  |  | $ | 38,029,657 |
|  | Six Months Ended March 31, 2024 |  |  | Six Months Ended March 31, 2023 |
|  | Gas utility |  |  | Non utility |  |  | Total operating revenues |  |  | Gas utility |  |  | Non utility |  |  | Total operating revenues |
Natural Gas (Billed and Unbilled): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 32,667,707 |  |  | $ | — |  |  | $ | 32,667,707 |  |  | $ | 40,742,276 |  |  | $ | — |  |  | $ | 40,742,276 |
Commercial |  |  | 18,240,077 |  |  |  | — |  |  |  | 18,240,077 |  |  |  | 24,044,169 |  |  |  | — |  |  |  | 24,044,169 |
Transportation and interruptible |  |  | 2,729,261 |  |  |  | — |  |  |  | 2,729,261 |  |  |  | 3,153,238 |  |  |  | — |  |  |  | 3,153,238 |
Other |  |  | 485,057 |  |  |  | 54,543 |  |  |  | 539,600 |  |  |  | 684,918 |  |  |  | 58,248 |  |  |  | 743,166 |
Total contracts with customers |  |  | 54,122,102 |  |  |  | 54,543 |  |  |  | 54,176,645 |  |  |  | 68,624,601 |  |  |  | 58,248 |  |  |  | 68,682,849 |
Alternative revenue programs |  |  | 2,902,083 |  |  |  | — |  |  |  | 2,902,083 |  |  |  | 2,629,143 |  |  |  | — |  |  |  | 2,629,143 |
Total operating revenues |  | $ | 57,024,185 |  |  | $ | 54,543 |  |  | $ | 57,078,728 |  |  | $ | 71,253,744 |  |  | $ | 58,248 |  |  | $ | 71,311,992 |
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 March 31, 2024 |  |  | 6,485,713 |  |  |  | 2,850,532 |  |  |  | 947,563 |  |  |  | 1,697,018 |
Increase (decrease) |  | $ | 3,703,688 |  |  | $ | 1,610,435 |  |  | $ | (1,024,569 | ) |  | $ | 220,697 |

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