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Note 3 - Segment Information - Segment Information (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Sep. 30, 2023
Operating revenues $ 14,458,202 $ 13,660,245 $ 71,536,930 $ 84,972,237  
Depreciation 2,697,707 2,419,541 8,093,121 7,258,623  
Operating income (loss) 1,557,593 1,798,465 16,839,339 16,934,372  
Equity in earnings 282,604 519,482 2,979,823 523,581  
Interest expense 1,567,093 1,423,566 4,769,979 4,188,592  
Income (loss) before income taxes 203,755 901,106 15,190,107 13,472,516  
Total assets 314,154,160   314,154,160   $ 303,729,340
Operating Segments [Member] | Gas Utility [Member]          
Operating revenues 14,431,379 13,631,856 71,455,564 84,885,600  
Depreciation 2,697,707 2,419,541 8,093,121 7,258,623  
Operating income (loss) 1,574,375 1,839,910 16,884,683 17,034,575  
Equity in earnings 0 0 0  
Interest expense 868,000 808,384 2,748,741 2,441,296  
Income (loss) before income taxes 637,332 1,039,212 14,277,365 14,798,527  
Total assets 274,432,384   274,432,384   268,664,460
Operating Segments [Member] | Investment in Affiliates [Member]          
Operating revenues 0 0 0  
Depreciation 0 0 0  
Operating income (loss) (37,692) (63,766) (106,380) (169,217)  
Equity in earnings 282,604 519,482 2,979,823 523,581  
Interest expense 699,093 615,182 2,021,238 1,747,296  
Income (loss) before income taxes (454,462) (160,402) 851,777 (1,394,950)  
Total assets 20,418,572   20,418,572   17,882,108
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]          
Operating revenues 26,823 28,389 81,366 86,637  
Depreciation 0 0 0  
Operating income (loss) 20,910 22,321 61,036 69,014  
Equity in earnings 0 0 0  
Interest expense 0 0 0  
Income (loss) before income taxes 20,885 $ 22,296 60,965 $ 68,939  
Total assets $ 19,303,204   $ 19,303,204   $ 17,182,772