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Note 4 - Vessels, Net (Details) - Summary of Vessels - USD ($)
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Summary of Vessels [Abstract]    
Balance, January 1, 2015 $ 140,389,916  
Balance, January 1, 2015 (29,239,689)  
Balance, January 1, 2015 111,150,227  
Depreciation for the period (5,780,952) $ (5,825,417)
Balance, June 30, 2015 140,389,916  
Balance, June 30, 2015 (35,020,641)  
Balance, June 30, 2015 $ 105,369,275