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Note 3 - Revenue (Tables) | 6 Months Ended
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Mar. 31, 2022
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended March 31, 2022 |  |  | Three Months Ended March 31, 2021 |
|  | Gas utility |  |  | Non utility |  |  | Total operating revenues |  |  | Gas utility |  |  | Non utility |  |  | Total operating revenues |
Natural Gas (Billed and Unbilled): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 18,104,512 |  |  | $ | — |  |  | $ | 18,104,512 |  |  | $ | 17,402,552 |  |  | $ | — |  |  | $ | 17,402,552 |
Commercial |  |  | 9,487,312 |  |  |  | — |  |  |  | 9,487,312 |  |  |  | 9,264,611 |  |  |  | — |  |  |  | 9,264,611 |
Industrial and Transportation |  |  | 1,352,161 |  |  |  | — |  |  |  | 1,352,161 |  |  |  | 1,252,343 |  |  |  | — |  |  |  | 1,252,343 |
Other |  |  | 138,035 |  |  |  | 30,464 |  |  |  | 168,499 |  |  |  | 95,092 |  |  |  | 32,388 |  |  |  | 127,480 |
Total contracts with customers |  |  | 29,082,020 |  |  |  | 30,464 |  |  |  | 29,112,484 |  |  |  | 28,014,598 |  |  |  | 32,388 |  |  |  | 28,046,986 |
Alternative Revenue Programs |  |  | 417,199 |  |  |  | — |  |  |  | 417,199 |  |  |  | 206,676 |  |  |  | — |  |  |  | 206,676 |
Total operating revenues |  | $ | 29,499,219 |  |  | $ | 30,464 |  |  | $ | 29,529,683 |  |  | $ | 28,221,274 |  |  | $ | 32,388 |  |  | $ | 28,253,662 |
|  | Six Months Ended March 31, 2022 |  |  | Six Months Ended March 31, 2021 |
|  | Gas utility |  |  | Non utility |  |  | Total operating revenues |  |  | Gas utility |  |  | Non utility |  |  | Total operating revenues |
Natural Gas (Billed and Unbilled): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 31,317,001 |  |  | $ | — |  |  | $ | 31,317,001 |  |  | $ | 28,648,746 |  |  | $ | — |  |  | $ | 28,648,746 |
Commercial |  |  | 16,873,030 |  |  |  | — |  |  |  | 16,873,030 |  |  |  | 15,254,631 |  |  |  | — |  |  |  | 15,254,631 |
Industrial and Transportation |  |  | 2,665,252 |  |  |  | — |  |  |  | 2,665,252 |  |  |  | 2,476,144 |  |  |  | — |  |  |  | 2,476,144 |
Other |  |  | 361,863 |  |  |  | 61,889 |  |  |  | 423,752 |  |  |  | 256,169 |  |  |  | 65,905 |  |  |  | 322,074 |
Total contracts with customers |  |  | 51,217,146 |  |  |  | 61,889 |  |  |  | 51,279,035 |  |  |  | 46,635,690 |  |  |  | 65,905 |  |  |  | 46,701,595 |
Alternative Revenue Programs |  |  | 1,513,728 |  |  |  | — |  |  |  | 1,513,728 |  |  |  | 1,069,084 |  |  |  | — |  |  |  | 1,069,084 |
Total operating revenues |  | $ | 52,730,874 |  |  | $ | 61,889 |  |  | $ | 52,792,763 |  |  | $ | 47,704,774 |  |  | $ | 65,905 |  |  | $ | 47,770,679 |
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 March 31, 2022 |  |  | 7,872,022 |  |  |  | 3,057,298 |  |  |  | 682,959 |  |  |  | 1,583,542 |
Increase (decrease) |  | $ | 4,149,106 |  |  | $ | 1,866,071 |  |  | $ | (856,721 | ) |  | $ | 12,200 |

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