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Note 13 - Segment Information - Segment Information (Details) - USD ($)
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2021
Operating revenues $ 23,263,080 $ 19,517,017  
Depreciation 2,270,694 2,153,398  
Operating income (loss) 5,378,423 5,581,387  
Equity in earnings 72,127 1,356,683  
Interest expense 1,104,856 1,019,829  
Income (loss) before income taxes 4,668,133 6,248,267  
Total assets 323,230,892   $ 310,109,193
Operating Segments [Member] | Gas Utility [Member]      
Operating revenues 23,231,655 19,483,500  
Depreciation 2,270,694 2,153,398  
Operating income (loss) 5,404,316 5,613,042  
Equity in earnings 0 0  
Interest expense 764,863 704,330  
Income (loss) before income taxes 4,959,182 5,236,000  
Total assets 242,149,871   231,737,427
Operating Segments [Member] | Investment in Affiliates [Member]      
Operating revenues 0 0  
Depreciation 0 0  
Operating income (loss) (51,560) (50,847)  
Equity in earnings 72,127 1,356,683  
Interest expense 339,993 315,499  
Income (loss) before income taxes (316,881) 992,925  
Total assets 68,094,574   65,686,376
Corporate, Non-Segment [Member]      
Operating revenues 31,425 33,517  
Depreciation 0 0  
Operating income (loss) 25,667 19,192  
Equity in earnings 0 0  
Interest expense 0 0  
Income (loss) before income taxes 25,832 $ 19,342  
Total assets $ 12,986,447   $ 12,685,390