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Note 15 - Segment Information - Segment Information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Sep. 30, 2021
Operating revenues $ 29,529,683 $ 28,253,662 $ 52,792,763 $ 47,770,679  
Depreciation 2,268,704 2,128,304 4,539,398 4,281,702  
Operating income (loss) 7,443,388 7,099,426 12,821,811 12,680,813  
Equity in earnings (loss) (445) (3,797) 71,682 1,352,886  
Pre-tax impairment 39,822,213 (0) 39,822,213 (0)  
Interest expense 1,103,844 1,007,764 2,208,700 2,027,593  
Income (loss) before income taxes (33,138,604) 6,375,413 (28,470,471) 12,623,680  
Operating revenues 29,529,683 28,253,662 52,792,763 47,770,679  
Total assets 288,358,485   288,358,485   $ 310,109,193
Operating Segments [Member] | Gas Utility [Member]          
Operating revenues 29,499,219 28,221,274 52,730,874 47,704,774  
Depreciation 2,268,704 2,128,304 4,539,398 4,281,702  
Operating income (loss) 7,528,839 7,175,532 12,933,155 12,788,574  
Equity in earnings (loss) 0 0 0 0  
Pre-tax impairment (0)   (0)    
Interest expense 751,038 707,532 1,515,901 1,411,862  
Income (loss) before income taxes 7,117,202 6,750,004 12,076,384 11,986,004  
Operating revenues 29,499,219 28,221,274 52,730,874 47,704,774  
Total assets 240,934,602   240,934,602   231,737,427
Operating Segments [Member] | Investment in Affiliates [Member]          
Operating revenues 0 0 0 0  
Depreciation 0 0 0 0  
Operating income (loss) (108,987) (102,295) (160,547) (153,142)  
Equity in earnings (loss) (445) (3,797) 71,682 1,352,886  
Pre-tax impairment 39,822,213   39,822,213    
Interest expense 352,806 300,232 692,799 615,731  
Income (loss) before income taxes (40,279,495) (400,880) (40,596,376) 592,045  
Operating revenues 0 0 0 0  
Total assets 27,465,020   27,465,020   65,686,376
Corporate, Non-Segment [Member]          
Operating revenues 30,464 32,388 61,889 65,905  
Depreciation 0 0 0 0  
Operating income (loss) 23,536 26,189 49,203 45,381  
Equity in earnings (loss) 0 0 0 0  
Pre-tax impairment (0)   (0)    
Interest expense 0 0 0 0  
Income (loss) before income taxes 23,689 26,289 49,521 45,631  
Operating revenues 30,464 $ 32,388 61,889 $ 65,905  
Total assets $ 19,958,863   $ 19,958,863   $ 12,685,390