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Note 3 - Segment Information - Segment Information (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Sep. 30, 2024
Revenue $ 36,462,097 $ 32,659,376 $ 63,751,583 $ 57,078,728  
Depreciation and amortization 2,856,768 2,697,707 5,700,128 5,395,414  
Operating income (loss) 10,399,942 8,629,709 17,727,963 15,281,746  
Equity in earnings 801,175 1,229,384 1,655,388 2,697,219  
Interest expense 1,630,275 1,566,613 3,410,205 3,202,886  
Income before income taxes 10,034,475 8,381,967 16,910,115 14,986,352  
Assets 326,421,287   326,421,287   $ 320,699,223
Gross additions to utility property     10,692,338 11,279,097 22,094,406
Gross investment in affiliates     35,164 3,381 18,258
Operating Segments [Member]          
Revenue 36,435,936 32,632,331 63,699,140 57,024,185  
Operating income (loss) 10,379,199 8,610,725 17,685,287 15,241,620  
Income before income taxes 10,013,732 8,363,004 16,867,439 14,946,272  
Assets 305,263,007   305,263,007   301,833,350
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]          
Revenue 26,161 27,045 52,443 54,543  
Operating income (loss) 20,743 18,984 42,676 40,126  
Income before income taxes 20,743 18,963 42,676 40,080  
Assets 21,158,280   21,158,280   18,865,873
Gas Utility [Member]          
Revenue 36,435,936 32,632,331 63,699,140 57,024,185  
Depreciation and amortization 2,856,768 2,697,707 5,700,128 5,395,414  
Operating income (loss) 10,417,419 8,666,010 17,758,695 15,310,308  
Equity in earnings 0 0 0 0  
Interest expense 942,547 911,804 1,974,956 1,880,741  
Income before income taxes 9,937,983 7,844,299 16,719,641 13,640,033  
Assets 283,632,682   283,632,682   280,508,989
Gross additions to utility property     10,692,338   22,094,406
Gross investment in affiliates     0   0
Gas Utility [Member] | Operating Segments [Member]          
Revenue 36,435,936 32,632,331 63,699,140 57,024,185  
Operating income (loss) 10,417,419 8,666,010 17,758,695 15,310,308  
Income before income taxes 9,937,983 7,844,299 16,719,641 13,640,033  
Assets 283,632,682   283,632,682   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) (38,220) (55,285) (73,408) (68,688)  
Equity in earnings 801,175 1,229,384 1,655,388 2,697,219  
Interest expense 687,728 654,809 1,435,249 1,322,145  
Income before income taxes 75,749 518,705 147,798 1,306,239  
Assets 21,630,325   21,630,325   21,324,361
Gross additions to utility property     0   0
Gross investment in affiliates     35,164   18,258
Investment in Affiliates [Member] | Operating Segments [Member]          
Revenue 0 0 0 0  
Operating income (loss) (38,220) (55,285) (73,408) (68,688)  
Income before income taxes 75,749 518,705 147,798 1,306,239  
Assets 21,630,325   21,630,325   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