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Note 7 - Long-term Debt (Details Textual) - USD ($)
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Jul. 31, 2020
Debt Instrument, Deferred Debt Amount     $ 5,200,000
Restricted Cash, Total $ 2,008,593 $ 4,410,376  
Interest Expense, Total $ 3,320,074 $ 2,272,181  
Minimum [Member]      
Debt Instrument Covenant, Ratio of Fair Value of Vessel to Outstanding Loan Less Cash in Retention Accounts 120.00%    
Maximum [Member]      
Debt Instrument Covenant, Ratio of Fair Value of Vessel to Outstanding Loan Less Cash in Retention Accounts 140.00%