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Note 6 - Other Investments - Investment in Unconsolidated Entity (Details) - USD ($)
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Other income, net $ 120,786 $ 74,606    
Net income 5,019,992 3,256,405    
Current assets 34,769,875   $ 26,795,262  
Total assets 314,703,235   303,729,340  
Current liabilities 64,196,722   32,918,787  
Capital 103,544,603 94,890,007 100,732,625 $ 93,090,656
Total liabilities and equity 314,703,235   303,729,340  
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]        
Current assets 349,417,551   795,787,358  
Construction work in progress 8,468,379,830   7,499,128,254  
Other assets 12,160,170   11,639,586  
Total assets 8,829,957,551   8,306,555,198  
Current liabilities 371,508,693   236,947,158  
Capital 8,458,448,858   8,069,608,040  
Total liabilities and equity 8,829,957,551   $ 8,306,555,198  
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | MVP [Member]        
AFUDC 158,562,141 0    
Other income, net 2,663,569 160,472    
Net income $ 161,225,710 $ 160,472