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Note 3 - Segment Information - Segment Information (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Revenue | $ 95,334,212 | $ 84,641,232
Operations and maintenance | 19,911,410 | 18,354,736
Taxes other than income taxes | 2,933,787 | 2,694,652
Depreciation and amortization | 11,470,641 | 10,518,094
Operating income (loss) | 18,447,501 | 17,081,760
Equity in earnings | 3,234,632 | 3,851,871
Interest expense | 6,543,511 | 6,504,885
Income before income taxes | 17,371,505 | 15,457,507
Assets | 329,839,566 | 320,699,223
Gross additions to utility property | 20,730,140 | 22,094,406
Gross investment in affiliates | 76,385 | 18,258
Gas Utility [Member] |  |
Revenue | 95,231,943 | 84,533,101
Cost of Product and Service Sold | 42,550,954 | 35,967,987
Operating Segments [Member] |  |
Revenue | 95,231,943 | 84,533,101
Operations and maintenance | 19,911,410 | 18,348,840
Taxes other than income taxes | 2,933,787 | 2,704,540
Income before income taxes | 17,289,155 | 15,369,499
Assets | 313,250,313 | 301,833,350
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] |  |
Revenue | 102,269 | 108,131
Operating income (loss) | 19,919 | 20,011
Income before income taxes | 82,350 | 88,008
Assets | 16,589,253 | 18,865,873
Gas Utility [Member] |  |
Revenue | 95,231,943 | 84,533,101
Depreciation and amortization | 11,470,641 | 10,518,094
Operating income (loss) | 18,549,566 | 17,130,480
Equity in earnings | 0 | 0
Interest expense | 3,706,152 | 3,700,674
Income before income taxes | 17,072,877 | 14,459,009
Assets | 291,571,159 | 280,508,989
Gross additions to utility property | 20,730,140 | 22,094,406
Gross investment in affiliates | 0 | 0
Gas Utility [Member] | Gas Utility [Member] |  |
Cost of Product and Service Sold | 42,550,954 | 35,967,987
Gas Utility [Member] | Operating Segments [Member] |  |
Revenue | 95,231,943 | 84,533,101
Operations and maintenance | 19,729,415 | 18,215,354
Taxes other than income taxes | 2,931,367 | 2,701,186
Income before income taxes | 17,072,877 | 14,459,009
Assets | 291,571,159 | 280,508,989
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) | (184,415) | (136,840)
Equity in earnings | 3,234,632 | 3,851,871
Interest expense | 2,837,359 | 2,804,211
Income before income taxes | 216,278 | 910,490
Assets | 21,679,154 | 21,324,361
Gross additions to utility property | 0 | 0
Gross investment in affiliates | 76,385 | 18,258
Investment in Affiliates [Member] | Gas Utility [Member] |  |
Cost of Product and Service Sold | 0 | 0
Investment in Affiliates [Member] | Operating Segments [Member] |  |
Revenue | 0 | 0
Operations and maintenance | 181,995 | 133,486
Taxes other than income taxes | 2,420 | 3,354
Income before income taxes | 216,278 | 910,490
Assets | 21,679,154 | 21,324,361
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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