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Note 3 - Segment Information - Segment Information (Details) - USD ($)
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Revenue $ 84,641,232 $ 97,439,765
Depreciation and amortization 10,518,094 9,764,678
Operating income (loss) 17,081,760 17,678,480
Equity in earnings 3,851,871 2,084,990
Interest expense 6,504,885 5,618,805
Income before income taxes 15,457,507 14,791,193
Assets 320,699,223 303,729,340
Gross additions to utility property 22,094,406 25,306,524
Gross investment in affiliates 18,258 2,133,534
Operating Segments [Member]    
Revenue 84,533,101 97,325,307
Operating income (loss) 16,993,640 17,594,418
Income before income taxes 15,369,499 14,707,227
Assets 301,833,350 286,546,568
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]    
Revenue 108,131 114,458
Operating income (loss) 88,120 84,062
Income before income taxes 88,008 83,966
Assets 18,865,873 17,182,772
Gas Utility [Member]    
Revenue 84,533,101 97,325,307
Depreciation and amortization 10,518,094 9,764,678
Operating income (loss) 17,130,480 17,827,485
Equity in earnings 0 0
Interest expense 3,700,674 3,216,220
Income before income taxes 14,459,009 15,260,605
Assets 280,508,989 268,664,460
Gross additions to utility property 22,094,406 25,306,524
Gross investment in affiliates 0 0
Gas Utility [Member] | Operating Segments [Member]    
Revenue 84,533,101 97,325,307
Operating income (loss) 17,130,480 17,827,485
Income before income taxes 14,459,009 15,260,605
Assets 280,508,989 268,664,460
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) (136,840) (233,067)
Equity in earnings 3,851,871 2,084,990
Interest expense 2,804,211 2,402,585
Income before income taxes 910,490 (553,378)
Assets 21,324,361 17,882,108
Gross additions to utility property 0 0
Gross investment in affiliates 18,258 2,133,534
Investment in Affiliates [Member] | Operating Segments [Member]    
Revenue 0 0
Operating income (loss) (136,840) (233,067)
Income before income taxes 910,490 (553,378)
Assets 21,324,361 17,882,108
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