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Note 3 - Segment Information - Segment Information (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Revenue | $ 84,641,232 | $ 97,439,765
Depreciation and amortization | 10,518,094 | 9,764,678
Operating income (loss) | 17,081,760 | 17,678,480
Equity in earnings | 3,851,871 | 2,084,990
Interest expense | 6,504,885 | 5,618,805
Income before income taxes | 15,457,507 | 14,791,193
Assets | 320,699,223 | 303,729,340
Gross additions to utility property | 22,094,406 | 25,306,524
Gross investment in affiliates | 18,258 | 2,133,534
Operating Segments [Member] |  |
Revenue | 84,533,101 | 97,325,307
Operating income (loss) | 16,993,640 | 17,594,418
Income before income taxes | 15,369,499 | 14,707,227
Assets | 301,833,350 | 286,546,568
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] |  |
Revenue | 108,131 | 114,458
Operating income (loss) | 88,120 | 84,062
Income before income taxes | 88,008 | 83,966
Assets | 18,865,873 | 17,182,772
Gas Utility [Member] |  |
Revenue | 84,533,101 | 97,325,307
Depreciation and amortization | 10,518,094 | 9,764,678
Operating income (loss) | 17,130,480 | 17,827,485
Equity in earnings | 0 | 0
Interest expense | 3,700,674 | 3,216,220
Income before income taxes | 14,459,009 | 15,260,605
Assets | 280,508,989 | 268,664,460
Gross additions to utility property | 22,094,406 | 25,306,524
Gross investment in affiliates | 0 | 0
Gas Utility [Member] | Operating Segments [Member] |  |
Revenue | 84,533,101 | 97,325,307
Operating income (loss) | 17,130,480 | 17,827,485
Income before income taxes | 14,459,009 | 15,260,605
Assets | 280,508,989 | 268,664,460
Gas Utility [Member] | Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] |  |
Revenue | 0 | 0
Operating income (loss) | 0 | 0
Income before income taxes | 0 | 0
Assets | 0 | 0
Investment in Affiliates [Member] |  |
Revenue | 0 | 0
Depreciation and amortization | 0 | 0
Operating income (loss) | (136,840) | (233,067)
Equity in earnings | 3,851,871 | 2,084,990
Interest expense | 2,804,211 | 2,402,585
Income before income taxes | 910,490 | (553,378)
Assets | 21,324,361 | 17,882,108
Gross additions to utility property | 0 | 0
Gross investment in affiliates | 18,258 | 2,133,534
Investment in Affiliates [Member] | Operating Segments [Member] |  |
Revenue | 0 | 0
Operating income (loss) | (136,840) | (233,067)
Income before income taxes | 910,490 | (553,378)
Assets | 21,324,361 | 17,882,108
Investment in Affiliates [Member] | Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] |  |
Revenue | 0 | 0
Operating income (loss) | 0 | 0
Income before income taxes | 0 | 0
Assets | $ 0 | $ 0

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