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Note 3 - Vessels, Net - Summary of Vessels (Details) - USD ($)
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Net book value $ 52,132,079  
Depreciation for the period (1,708,526) $ (1,897,782)
Net book value 50,425,420  
Vessels [Member]    
Costs 61,279,976  
Accumulated depreciation (9,147,897)  
Net book value 52,132,079  
Depreciation for the period (1,708,526)  
Vessel capitalized expenses 1,867  
Costs 61,281,843  
Accumulated depreciation (10,856,423)  
Net book value $ 50,425,420