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Note 5 - Other Investments - Investment in Unconsolidated Entity (Details) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2024
Mar. 31, 2023
Sep. 30, 2023
Sep. 30, 2022
Other income, net $ 89,487   $ 121,824   $ 210,273 $ 196,430    
Net income 6,443,390 $ 5,019,992 6,341,886 $ 3,256,405 11,463,382 9,598,291    
Current assets 28,525,645       28,525,645   $ 26,795,262  
Total assets 313,359,530       313,359,530   303,729,340  
Current liabilities 21,702,382       21,702,382   32,918,787  
Capital 110,543,862 $ 103,544,603 100,278,408 $ 94,890,007 110,543,862 100,278,408 100,732,625 $ 93,090,656
Total liabilities and equity 313,359,530       313,359,530   303,729,340  
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]                
Current assets 228,561,994       228,561,994   795,787,358  
Construction work in progress 9,087,392,726       9,087,392,726   7,499,128,254  
Other assets 12,421,629       12,421,629   11,639,586  
Total assets 9,328,376,349       9,328,376,349   8,306,555,198  
Current liabilities 238,854,774       238,854,774   236,947,158  
Noncurrent liabilities 34,000       34,000   0  
Capital 9,089,487,575       9,089,487,575   8,069,608,040  
Total liabilities and equity 9,328,376,349       9,328,376,349   $ 8,306,555,198  
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | MVP [Member]                
AFUDC 146,538,660   0   305,100,801 0    
Other income, net 3,236,493   259,240   5,900,062 419,712    
Net income $ 149,775,153   $ 259,240   $ 311,000,863 $ 419,712