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Note 5 - Other Investments - Investment in Unconsolidated Entity (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2024
Jun. 30, 2023
Sep. 30, 2023
Sep. 30, 2022
Revenue $ 14,458,202     $ 13,660,245     $ 71,536,930 $ 84,972,237    
Other income, net (69,349)     6,725     140,924 203,155    
Net income 156,692 $ 6,443,390 $ 5,019,992 686,816 $ 6,341,886 $ 3,256,405 11,620,074 10,285,107    
Current assets 25,408,031           25,408,031   $ 26,795,262  
Property, plant and equipment, net 243,962,476           243,962,476   232,617,093  
Total assets 314,154,160           314,154,160   303,729,340  
Current liabilities 23,782,556           23,782,556   32,918,787  
Capital 108,767,792 $ 110,543,862 $ 103,544,603 100,947,813 $ 100,278,408 $ 94,890,007 108,767,792 100,947,813 100,732,625 $ 93,090,656
Total liabilities and equity 314,154,160           314,154,160   303,729,340  
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]                    
Revenue 3,723,469     0     3,723,469 0    
Operating expenses (10,822,325)     0     (10,822,325) 0    
AFUDC 38,815,497     49,744,717     343,916,298 49,744,717    
Other income, net 1,899,904     304,093     7,799,966 723,805    
Net income 33,616,545     $ 50,048,810     344,617,408 $ 50,468,522    
Current assets 181,484,706           181,484,706   795,787,358  
Construction work in progress 0           0   7,499,128,254  
Property, plant and equipment, net 9,416,489,036           9,416,489,036   0  
Other assets 13,944,447           13,944,447   11,639,586  
Total assets 9,611,918,189           9,611,918,189   8,306,555,198  
Current liabilities 218,689,919           218,689,919   236,947,158  
Noncurrent liabilities 32,500           32,500   0  
Capital 9,393,195,770           9,393,195,770   8,069,608,040  
Total liabilities and equity $ 9,611,918,189           $ 9,611,918,189   $ 8,306,555,198