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Note 15 - Segment Information - Segment Information (Details) - USD ($)
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2023
Operating revenues $ 24,419,352 $ 33,282,335  
Depreciation 2,697,707 2,419,541  
Operating income (loss) 6,652,037 5,544,485  
Equity in earnings 1,467,835 1,232  
Interest expense 1,636,273 1,369,164  
Income before income taxes 6,604,385 4,251,159  
Total assets 314,703,235   $ 303,729,340
Operating Segments [Member] | Gas Utility [Member]      
Operating revenues 24,391,854 33,252,767  
Depreciation 2,697,707 2,419,541  
Operating income (loss) 6,644,298 5,567,345  
Equity in earnings 0 0  
Interest expense 968,937 822,566  
Income before income taxes 5,795,734 4,819,955  
Total assets 278,936,342   268,664,460
Operating Segments [Member] | Investment in Affiliates [Member]      
Operating revenues 0 0  
Depreciation 0 0  
Operating income (loss) (13,403) (46,704)  
Equity in earnings 1,467,835 1,232  
Interest expense 667,336 546,598  
Income before income taxes 787,534 (592,615)  
Total assets 19,367,243   17,882,108
Corporate, Non-Segment [Member]      
Operating revenues 27,498 29,568  
Depreciation 0 0  
Operating income (loss) 21,142 23,844  
Equity in earnings 0 0  
Interest expense 0 0  
Income before income taxes 21,117 $ 23,819  
Total assets $ 16,399,650   $ 17,182,772