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Note 3 - Segment Information - Segment Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023
Operating revenues | $ 32,659,376 | $ 38,029,657 | $ 57,078,728 | $ 71,311,992 |
Depreciation | 2,697,707 | 2,419,541 | 5,395,414 | 4,839,082 |
Operating income (loss) | 8,629,709 | 9,591,422 | 15,281,746 | 15,135,907 |
Equity in earnings | 1,229,384 | 2,867 | 2,697,219 | 4,099 |
Interest expense | 1,566,613 | 1,395,862 | 3,202,886 | 2,765,026 |
Income before income taxes | 8,381,967 | 8,320,251 | 14,986,352 | 12,571,410 |
Total assets | 313,359,530 |  | 313,359,530 |  | $ 303,729,340
Operating Segments [Member] | Gas Utility [Member] |  |  |  |  |
Operating revenues | 32,632,331 | 38,000,977 | 57,024,185 | 71,253,744 |
Depreciation | 2,697,707 | 2,419,541 | 5,395,414 | 4,839,082 |
Operating income (loss) | 8,666,010 | 9,627,320 | 15,310,308 | 15,194,665 |
Equity in earnings | 0 | 0 | 0 |  |
Interest expense | 911,804 | 810,346 | 1,880,741 | 1,632,912 |
Income before income taxes | 7,844,299 | 8,939,360 | 13,640,033 | 13,759,315 |
Total assets | 271,487,651 |  | 271,487,651 |  | 268,664,460
Operating Segments [Member] | Investment in Affiliates [Member] |  |  |  |  |
Operating revenues | 0 | 0 | 0 |  |
Depreciation | 0 | 0 | 0 |  |
Operating income (loss) | (55,285) | (58,747) | (68,688) | (105,451) |
Equity in earnings | 1,229,384 | 2,867 | 2,697,219 | 4,099 |
Interest expense | 654,809 | 585,516 | 1,322,145 | 1,132,114 |
Income before income taxes | 518,705 | (641,933) | 1,306,239 | (1,234,548) |
Total assets | 20,181,544 |  | 20,181,544 |  | 17,882,108
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] |  |  |  |  |
Operating revenues | 27,045 | 28,680 | 54,543 | 58,248 |
Depreciation | 0 | 0 | 0 |  |
Operating income (loss) | 18,984 | 22,849 | 40,126 | 46,693 |
Equity in earnings | 0 | 0 | 0 |  |
Interest expense | 0 | 0 | 0 |  |
Income before income taxes | 18,963 | $ 22,824 | 40,080 | $ 46,643 |
Total assets | $ 21,690,335 |  | $ 21,690,335 |  | $ 17,182,772

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