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Note 3 - Revenue (Tables) | 3 Months Ended
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Dec. 31, 2023
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended December 31, 2023 |  |  | Three Months Ended December 31, 2022 |
|  | Gas utility |  |  | Non utility |  |  | Total operating revenues |  |  | Gas utility |  |  | Non utility |  |  | Total operating revenues |
Natural Gas (Billed and Unbilled): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 13,824,642 |  |  | $ | — |  |  | $ | 13,824,642 |  |  | $ | 19,365,840 |  |  | $ | — |  |  | $ | 19,365,840 |
Commercial |  |  | 7,841,726 |  |  |  | — |  |  |  | 7,841,726 |  |  |  | 12,019,113 |  |  |  | — |  |  |  | 12,019,113 |
Transportation and interruptible |  |  | 1,370,270 |  |  |  | — |  |  |  | 1,370,270 |  |  |  | 1,588,068 |  |  |  | — |  |  |  | 1,588,068 |
Other |  |  | 293,888 |  |  |  | 27,498 |  |  |  | 321,386 |  |  |  | 421,995 |  |  |  | 29,568 |  |  |  | 451,563 |
Total contracts with customers |  |  | 23,330,526 |  |  |  | 27,498 |  |  |  | 23,358,024 |  |  |  | 33,395,016 |  |  |  | 29,568 |  |  |  | 33,424,584 |
Alternative revenue programs |  |  | 1,061,328 |  |  |  | — |  |  |  | 1,061,328 |  |  |  | (142,249 | ) |  |  | — |  |  |  | (142,249 | )
Total operating revenues |  | $ | 24,391,854 |  |  | $ | 27,498 |  |  | $ | 24,419,352 |  |  | $ | 33,252,767 |  |  | $ | 29,568 |  |  | $ | 33,282,335 |
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 December 31, 2023 |  |  | 8,302,330 |  |  |  | 4,757,101 |  |  |  | 1,882,100 |  |  |  | 1,646,267 |
Increase (decrease) |  | $ | 5,520,305 |  |  | $ | 3,517,004 |  |  | $ | (90,032 | ) |  | $ | 169,946 |

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