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Note 3 - Segment Information - Segment Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Sep. 30, 2024
Revenue | $ 17,264,615 | $ 14,458,202 | $ 81,016,198 | $ 71,536,930 |
Depreciation and amortization | 2,909,344 | 2,697,707 | 8,609,472 | 8,093,121 |
Operating income (loss) | 1,196,560 | 1,557,593 | 18,924,523 | 16,839,339 |
Equity in earnings | 772,082 | 282,604 | 2,427,470 | 2,979,823 |
Interest expense | 1,512,754 | 1,567,093 | 4,922,959 | 4,769,979 |
Income before income taxes | 699,888 | 203,755 | 17,610,003 | 15,190,107 |
Assets | 324,757,993 |  | 324,757,993 |  | $ 320,699,223
Gross additions to utility property |  |  | 15,739,170 | 16,568,542 | 22,094,406
Gross investment in affiliates |  |  | 50,894 | 8,743 | 18,258
Operating Segments [Member] |  |  |  |  |
Revenue | 17,239,550 | 14,431,379 | 80,938,690 | 71,455,564 |
Operating income (loss) | 1,176,286 | 1,536,683 | 18,861,573 | 16,778,303 |
Income before income taxes | 679,614 | 182,870 | 17,547,053 | 15,129,142 |
Assets | 306,778,062 |  | 306,778,062 |  | 301,833,350
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] |  |  |  |  |
Revenue | 25,065 | 26,823 | 77,508 | 81,366 |
Operating income (loss) | 20,274 | 20,910 | 62,950 | 61,036 |
Income before income taxes | 20,274 | 20,885 | 62,950 | 60,965 |
Assets | 17,979,931 |  | 17,979,931 |  | 18,865,873
Gas Utility [Member] |  |  |  |  |
Revenue | 17,239,550 | 14,431,379 | 80,938,690 | 71,455,564 |
Depreciation and amortization | 2,909,344 | 2,697,707 | 8,609,472 | 8,093,121 |
Operating income (loss) | 1,219,977 | 1,574,375 | 18,978,672 | 16,884,683 |
Equity in earnings | 0 | 0 | 0 | 0 |
Interest expense | 822,022 | 868,000 | 2,796,978 | 2,748,741 |
Income before income taxes | 640,938 | 637,332 | 17,360,579 | 14,277,365 |
Assets | 285,220,121 |  | 285,220,121 |  | 280,508,989
Gross additions to utility property |  |  | 15,739,170 |  | 22,094,406
Gross investment in affiliates |  |  | 0 |  | 0
Gas Utility [Member] | Operating Segments [Member] |  |  |  |  |
Revenue | 17,239,550 | 14,431,379 | 80,938,690 | 71,455,564 |
Operating income (loss) | 1,219,977 | 1,574,375 | 18,978,672 | 16,884,683 |
Income before income taxes | 640,938 | 637,332 | 17,360,579 | 14,277,365 |
Assets | 285,220,121 |  | 285,220,121 |  | 280,508,989
Gas Utility [Member] | Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] |  |  |  |  |
Revenue | 0 | 0 | 0 | 0 |
Operating income (loss) | 0 | 0 | 0 | 0 |
Income before income taxes | 0 | 0 | 0 | 0 |
Assets | 0 |  | 0 |  | 0
Investment in Affiliates [Member] |  |  |  |  |
Revenue | 0 | 0 | 0 | 0 |
Depreciation and amortization | 0 | 0 | 0 | 0 |
Operating income (loss) | (43,691) | (37,692) | (117,099) | (106,380) |
Equity in earnings | 772,082 | 282,604 | 2,427,470 | 2,979,823 |
Interest expense | 690,732 | 699,093 | 2,125,981 | 2,021,238 |
Income before income taxes | 38,676 | (454,462) | 186,474 | 851,777 |
Assets | 21,557,941 |  | 21,557,941 |  | 21,324,361
Gross additions to utility property |  |  | 0 |  | 0
Gross investment in affiliates |  |  | 50,894 |  | 18,258
Investment in Affiliates [Member] | Operating Segments [Member] |  |  |  |  |
Revenue | 0 | 0 | 0 | 0 |
Operating income (loss) | (43,691) | (37,692) | (117,099) | (106,380) |
Income before income taxes | 38,676 | (454,462) | 186,474 | 851,777 |
Assets | 21,557,941 |  | 21,557,941 |  | 21,324,361
Investment in Affiliates [Member] | Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] |  |  |  |  |
Revenue | 0 | 0 | 0 | 0 |
Operating income (loss) | 0 | 0 | 0 | 0 |
Income before income taxes | 0 | $ 0 | 0 | $ 0 |
Assets | $ 0 |  | $ 0 |  | $ 0

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