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Note 6 - Other Investments - Investment in Unconsolidated Entity (Details) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2022
Mar. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Other income (expense), net $ 344,510   $ 287,548   $ 666,949 $ 617,574    
Net income (loss) (24,494,429) $ 3,584,529 4,767,478 $ 4,723,263 (20,909,900) 9,490,741    
Current assets 32,520,634       32,520,634   $ 25,143,855  
Total assets 288,358,485       288,358,485   310,109,193  
Current liabilities 36,576,652       36,576,652   26,013,532  
Capital 105,462,729 $ 102,294,845 97,574,608 $ 92,549,541 105,462,729 97,574,608 99,701,709 $ 88,887,977
Total liabilities and equity 288,358,485       288,358,485   310,109,193  
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | MVP [Member]                
AFUDC 0   0   6,883,069 133,757,314    
Other income (expense), net 9,245   5,514   (35,818) (47,094)    
Net income (loss) 9,245   $ 5,514   6,847,251 $ 133,710,220    
Current assets 118,201,286       118,201,286   208,961,113  
Construction work in progress 6,514,077,686       6,514,077,686   6,281,991,035  
Other assets 1,190,042       1,190,042   980,410  
Total assets 6,633,469,014       6,633,469,014   6,491,932,558  
Current liabilities 146,102,517       146,102,517   200,441,027  
Noncurrent liabilities 45,000       45,000   13,000  
Capital 6,487,321,497       6,487,321,497   6,291,478,531  
Total liabilities and equity $ 6,633,469,014       $ 6,633,469,014   $ 6,491,932,558