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Note 8 - Long-term Bank Loans (Details Textual) - USD ($)
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2019
Restricted Cash, Total $ 5,575,234   $ 4,967,285  
Interest Expense, Total $ 2,146,602 $ 1,381,667    
Piraeus Bank S.A. [Member] | Minimum [Member]        
Debt Instrument, Security Cover Ratio Covenant, After First Anniversary       120.00%
Piraeus Bank S.A. [Member] | Maximum [Member]        
Debt Instrument, Security Cover Ratio Covenant, After First Anniversary       140.00%