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Note 4 - Vessels, Net - Summary of Vessels (Details) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Net Book Value $ 105,584,633  
Depreciation for the period (2,117,645) $ (2,134,474)
Net Book Value 123,883,084  
Vessels [Member]    
Costs 139,378,104  
Accumulated Depreciation (33,793,471)  
Net Book Value 105,584,633  
Depreciation for the period (2,117,645)  
Vessel acquisition 4,473,448  
Vessel sale, Costs (1,807,199)  
Vessel sale (1,807,199)  
Delivery of new building vessel 17,749,847  
Costs 159,794,200  
Accumulated Depreciation (35,911,116)  
Net Book Value $ 123,883,084