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Note 3 - Segment Information - Segment Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2024
Revenue $ 27,289,486 $ 24,419,352  
Depreciation and amortization 2,843,360 2,697,707  
Operating income (loss) 7,328,021 6,652,037  
Equity in earnings 854,213 1,467,835  
Interest expense 1,779,930 1,636,273  
Income before income taxes 6,875,640 6,604,385  
Assets 335,172,472   $ 320,699,223
Gross additions to utility property 5,748,177 5,300,669 22,094,406
Gross investment in affiliates 17,738 (0) 18,258
Operating Segments [Member]      
Revenue 27,263,204 24,391,854  
Operating income (loss) 7,306,088 6,630,895  
Income before income taxes 6,853,707 6,583,268  
Assets 318,608,930   301,833,350
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]      
Revenue 26,282 27,498  
Operating income (loss) 21,933 21,142  
Income before income taxes 21,933 21,117  
Assets 16,563,542   18,865,873
Gas Utility [Member]      
Revenue 27,263,204 24,391,854  
Depreciation and amortization 2,843,360 2,697,707  
Operating income (loss) 7,341,276 6,644,298  
Equity in earnings 0 0  
Interest expense 1,032,409 968,937  
Income before income taxes 6,781,658 5,795,734  
Assets 297,160,045   280,508,989
Gross additions to utility property 5,748,177   22,094,406
Gross investment in affiliates 0   0
Gas Utility [Member] | Operating Segments [Member]      
Revenue 27,263,204 24,391,854  
Operating income (loss) 7,341,276 6,644,298  
Income before income taxes 6,781,658 5,795,734  
Assets 297,160,045   280,508,989
Gas Utility [Member] | Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]      
Revenue 0 0  
Operating income (loss) 0 0  
Income before income taxes 0 0  
Assets 0   0
Investment in Affiliates [Member]      
Revenue 0 0  
Depreciation and amortization 0 0  
Operating income (loss) (35,188) (13,403)  
Equity in earnings 854,213 1,467,835  
Interest expense 747,521 667,336  
Income before income taxes 72,049 787,534  
Assets 21,448,885   21,324,361
Gross additions to utility property 0   0
Gross investment in affiliates 17,738   18,258
Investment in Affiliates [Member] | Operating Segments [Member]      
Revenue 0 0  
Operating income (loss) (35,188) (13,403)  
Income before income taxes 72,049 787,534  
Assets 21,448,885   21,324,361
Investment in Affiliates [Member] | Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]      
Revenue 0 0  
Operating income (loss) 0 0  
Income before income taxes 0 $ 0  
Assets $ 0   $ 0