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Note 3 - Advances for Vessels Under Construction (Details Textual)
Jun. 30, 2022
USD ($)
May 20, 2022
USD ($)
Mar. 18, 2022
USD ($)
Jan. 28, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jun. 29, 2021
USD ($)
Advances for Vessel Under Construction $ 37,796,368       $ 7,615,958  
Eco Design Fuel Efficient Containerships [Member]            
Number of Vessels Under Construction 9 2 3 2   2
Construction of Vessels, Amount to Be Financed with a Combination of Debt and Equity $ 352,900,000 $ 86,700,000 $ 103,800,000 $ 86,300,000   $ 76,100,000