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Note 5 - Other Investments - Investment in Unconsolidated Entity (Details) - USD ($)
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Net other income $ 646,528 $ 1,456,983  
Net income (loss) 11,299,282 (31,732,602)  
Current assets 26,795,262 35,548,319  
Total assets 303,729,340 290,309,243  
Current liabilities 32,918,787 22,315,310  
Capital 100,732,625 93,090,656 $ 99,701,709
Total liabilities and equity 303,729,340 290,309,243  
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]      
Current assets 795,787,358 76,474,981  
Construction work in progress 7,499,128,254 6,667,146,408  
Other assets 11,639,586 8,021,877  
Total assets 8,306,555,198 6,751,643,266  
Current liabilities 236,947,158 115,061,723  
Capital 8,069,608,040 6,636,581,543  
Total liabilities and equity 8,306,555,198 6,751,643,266  
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | MVP [Member]      
AFUDC 203,721,584 6,883,069  
Net other income 2,091,886 147,154  
Net income (loss) $ 205,813,470 $ 7,030,223