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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