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Note 2 - Revenue (Tables) | 3 Months Ended
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Dec. 31, 2024
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended December 31, 2024 |  |  | Three Months Ended December 31, 2023 |
|  | Gas utility |  |  | Non utility |  |  | Total operating revenues |  |  | Gas utility |  |  | Non utility |  |  | Total operating revenues |
Natural Gas (Billed and Unbilled): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 15,821,884 |  |  | $ | — |  |  | $ | 15,821,884 |  |  | $ | 13,824,642 |  |  | $ | — |  |  | $ | 13,824,642 |
Commercial |  |  | 9,244,995 |  |  |  | — |  |  |  | 9,244,995 |  |  |  | 7,841,726 |  |  |  | — |  |  |  | 7,841,726 |
Transportation and interruptible |  |  | 1,505,703 |  |  |  | — |  |  |  | 1,505,703 |  |  |  | 1,370,270 |  |  |  | — |  |  |  | 1,370,270 |
Other |  |  | 245,811 |  |  |  | 26,282 |  |  |  | 272,093 |  |  |  | 293,888 |  |  |  | 27,498 |  |  |  | 321,386 |
Total contracts with customers |  |  | 26,818,393 |  |  |  | 26,282 |  |  |  | 26,844,675 |  |  |  | 23,330,526 |  |  |  | 27,498 |  |  |  | 23,358,024 |
Alternative revenue programs |  |  | 444,811 |  |  |  | — |  |  |  | 444,811 |  |  |  | 1,061,328 |  |  |  | — |  |  |  | 1,061,328 |
Total operating revenues |  | $ | 27,263,204 |  |  | $ | 26,282 |  |  | $ | 27,289,486 |  |  | $ | 24,391,854 |  |  | $ | 27,498 |  |  | $ | 24,419,352 |
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 December 31, 2024 |  |  | 9,403,466 |  |  |  | 6,489,021 |  |  |  | 1,981,392 |  |  |  | 1,555,134 |
Increase |  | $ | 6,323,326 |  |  | $ | 5,194,223 |  |  | $ | 65,533 |  |  | $ | 67,021 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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