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Note 3 - Segment Information - Segment Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Sep. 30, 2023
Operating revenues | $ 14,458,202 | $ 13,660,245 | $ 71,536,930 | $ 84,972,237 |
Depreciation | 2,697,707 | 2,419,541 | 8,093,121 | 7,258,623 |
Operating income (loss) | 1,557,593 | 1,798,465 | 16,839,339 | 16,934,372 |
Equity in earnings | 282,604 | 519,482 | 2,979,823 | 523,581 |
Interest expense | 1,567,093 | 1,423,566 | 4,769,979 | 4,188,592 |
Income (loss) before income taxes | 203,755 | 901,106 | 15,190,107 | 13,472,516 |
Total assets | 314,154,160 |  | 314,154,160 |  | $ 303,729,340
Operating Segments [Member] | Gas Utility [Member] |  |  |  |  |
Operating revenues | 14,431,379 | 13,631,856 | 71,455,564 | 84,885,600 |
Depreciation | 2,697,707 | 2,419,541 | 8,093,121 | 7,258,623 |
Operating income (loss) | 1,574,375 | 1,839,910 | 16,884,683 | 17,034,575 |
Equity in earnings | 0 | 0 | 0 |  |
Interest expense | 868,000 | 808,384 | 2,748,741 | 2,441,296 |
Income (loss) before income taxes | 637,332 | 1,039,212 | 14,277,365 | 14,798,527 |
Total assets | 274,432,384 |  | 274,432,384 |  | 268,664,460
Operating Segments [Member] | Investment in Affiliates [Member] |  |  |  |  |
Operating revenues | 0 | 0 | 0 |  |
Depreciation | 0 | 0 | 0 |  |
Operating income (loss) | (37,692) | (63,766) | (106,380) | (169,217) |
Equity in earnings | 282,604 | 519,482 | 2,979,823 | 523,581 |
Interest expense | 699,093 | 615,182 | 2,021,238 | 1,747,296 |
Income (loss) before income taxes | (454,462) | (160,402) | 851,777 | (1,394,950) |
Total assets | 20,418,572 |  | 20,418,572 |  | 17,882,108
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] |  |  |  |  |
Operating revenues | 26,823 | 28,389 | 81,366 | 86,637 |
Depreciation | 0 | 0 | 0 |  |
Operating income (loss) | 20,910 | 22,321 | 61,036 | 69,014 |
Equity in earnings | 0 | 0 | 0 |  |
Interest expense | 0 | 0 | 0 |  |
Income (loss) before income taxes | 20,885 | $ 22,296 | 60,965 | $ 68,939 |
Total assets | $ 19,303,204 |  | $ 19,303,204 |  | $ 17,182,772

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