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Note 5 - Other Investments - Investment in Unconsolidated Entity (Details) - USD ($)
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Revenue $ 84,641,232 $ 97,439,765  
Other income, net 1,028,761 646,528  
Net income 11,760,896 11,299,282  
Current assets 25,072,301 26,795,262  
Property, plant and equipment, net 253,401,632 232,617,093  
Total assets 320,699,223 303,729,340  
Current liabilities 28,698,430 32,918,787  
Capital 108,136,775 100,732,625 $ 93,090,656
Total liabilities and equity 320,699,223 303,729,340  
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]      
Revenue 143,052,597 0  
Operating expenses (78,822,028) 0  
AFUDC 343,922,690 203,721,584  
Other income, net 9,900,128 2,091,886  
Net income 418,053,387 205,813,470  
Current assets 263,966,727 795,787,358  
Construction work in progress 1,568,267 7,499,128,254  
Property, plant and equipment, net 9,522,815,742 0  
Other assets 13,732,299 11,639,586  
Total assets 9,802,083,035 8,306,555,198  
Current liabilities 168,645,751 236,947,158  
Noncurrent liabilities 68,965 0  
Capital 9,633,368,319 8,069,608,040  
Total liabilities and equity $ 9,802,083,035 $ 8,306,555,198