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Note 5 - Other Investments - Investment in Unconsolidated Entity (Details) - USD ($)
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Other income, net $ 322,439 $ 330,026    
Net income 3,584,529 4,723,263    
Current assets 32,449,177   $ 25,143,855  
Total assets 323,230,892   310,109,193  
Current liabilities 44,758,986   26,013,532  
Capital 102,294,845 92,549,541 99,701,709 $ 88,887,977
Total liabilities and equity 323,230,892   310,109,193  
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | MVP [Member]        
AFUDC 6,883,069 133,757,314    
Other income, net (45,063) (52,608)    
Net income 6,838,006 $ 133,704,706    
Current assets 192,288,454   208,961,113  
Construction work in progress 6,429,791,662   6,281,991,035  
Other assets 2,496,119   980,410  
Total assets 6,624,576,235   6,491,932,558  
Current liabilities 160,282,681   200,441,027  
Noncurrent liabilities 48,000   13,000  
Capital 6,464,245,554   6,291,478,531  
Total liabilities and equity $ 6,624,576,235   $ 6,491,932,558