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Note 4 - Vessels, Net - Summary of Vessels (Details) - USD ($)
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Accumulated depreciation, depreciation for the period $ (4,273,776) $ (4,381,540)
Net book value 105,584,633  
Net book value 126,502,147  
Vessels [Member]    
Costs 139,378,104  
Costs, vessel acquisitions 9,209,949  
Costs, vessel sale (1,807,199)  
Costs, delivery of newbuilding vessel 17,788,540  
Costs 164,569,394  
Accumulated depreciation (33,793,471)  
Accumulated depreciation, depreciation for the period (4,273,776)  
Accumulated depreciation (38,067,247)  
Net book value 105,584,633  
Net book value $ 126,502,147