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Note 4 - Segment Information - Segment Information (Details) - USD ($)
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Operating revenues $ 97,439,765 $ 84,165,222
Depreciation 9,764,678 8,948,923
Operating income (loss) 17,678,480 14,916,675
Equity in earnings 2,084,990 73,327
Interest expense 5,618,805 4,497,929
Income (loss) before income taxes 14,791,193 (43,143,247)
Total assets 303,729,340 290,309,243
Gross additions to utility property 25,306,524 25,461,000
Gross investment in affiliates 2,133,534 5,260,863
Impairment of investments in affiliates 0 (55,092,303)
Operating Segments [Member] | Gas Utility [Member]    
Operating revenues 97,325,307 84,035,644
Depreciation 9,764,678 8,948,923
Operating income (loss) 17,827,485 15,104,946
Equity in earnings 0 0
Interest expense 3,216,220 3,001,926
Income (loss) before income taxes 15,260,605 13,547,601
Total assets 268,664,460 258,519,230
Gross additions to utility property 25,306,524 25,461,000
Gross investment in affiliates 0 0
Impairment of investments in affiliates   0
Operating Segments [Member] | Investment in Affiliates [Member]    
Operating revenues 0 0
Depreciation 0 0
Operating income (loss) (233,067) (281,843)
Equity in earnings 2,084,990 73,327
Interest expense 2,402,585 1,496,003
Income (loss) before income taxes (553,378) (56,784,957)
Total assets 17,882,108 13,838,108
Gross additions to utility property 0 0
Gross investment in affiliates 2,133,534 5,260,863
Impairment of investments in affiliates   (55,092,303)
Corporate, Non-Segment [Member]    
Operating revenues 114,458 129,578
Depreciation 0 0
Operating income (loss) 84,062 93,572
Equity in earnings 0 0
Interest expense 0 0
Income (loss) before income taxes 83,966 94,109
Total assets 17,182,772 17,951,905
Gross additions to utility property 0 0
Gross investment in affiliates $ 0 0
Impairment of investments in affiliates   $ 0