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Note 2 - Revenue (Tables) | 3 Months Ended
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Dec. 31, 2021
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended December 31, 2021 |  |  | Three Months Ended December 31, 2020 |
|  | Gas utility |  |  | Non utility |  |  | Total operating revenues |  |  | Gas utility |  |  | Non utility |  |  | Total operating revenues |
Natural Gas (Billed and Unbilled): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 13,212,489 |  |  | $ | — |  |  | $ | 13,212,489 |  |  | $ | 11,246,194 |  |  | $ | — |  |  | $ | 11,246,194 |
Commercial |  |  | 7,385,718 |  |  |  | — |  |  |  | 7,385,718 |  |  |  | 5,990,020 |  |  |  | — |  |  |  | 5,990,020 |
Industrial and Transportation |  |  | 1,313,091 |  |  |  | — |  |  |  | 1,313,091 |  |  |  | 1,223,801 |  |  |  | — |  |  |  | 1,223,801 |
Other |  |  | 223,828 |  |  |  | 31,425 |  |  |  | 255,253 |  |  |  | 161,077 |  |  |  | 33,517 |  |  |  | 194,594 |
Total contracts with customers |  |  | 22,135,126 |  |  |  | 31,425 |  |  |  | 22,166,551 |  |  |  | 18,621,092 |  |  |  | 33,517 |  |  |  | 18,654,609 |
Alternative Revenue Programs |  |  | 1,096,529 |  |  |  | — |  |  |  | 1,096,529 |  |  |  | 862,408 |  |  |  | — |  |  |  | 862,408 |
Total operating revenues |  | $ | 23,231,655 |  |  | $ | 31,425 |  |  | $ | 23,263,080 |  |  | $ | 19,483,500 |  |  | $ | 33,517 |  |  | $ | 19,517,017 |
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, 2021 |  | $ | 3,722,916 |  |  | $ | 1,191,227 |  |  | $ | 1,539,680 |  |  | $ | 1,571,342 |
Balance at December 31, 2021 |  |  | 8,237,566 |  |  |  | 3,476,497 |  |  |  | 1,387,836 |  |  |  | 1,611,093 |
Increase (decrease) |  | $ | 4,514,650 |  |  | $ | 2,285,270 |  |  | $ | (151,844 | ) |  | $ | 39,751 |

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