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Note 4 - Vessel, Net (Details Textual) - USD ($)
3 Months Ended
Jan. 31, 2017
Mar. 31, 2017
Mar. 31, 2016
Proceeds from Sale of Property, Plant, and Equipment   $ 5,137,010 $ 1,549,603
Gain (Loss) on Disposition of Property Plant Equipment   $ 516,561
M/V RT Dagr [Member]      
Proceeds from Sale of Property, Plant, and Equipment $ 2,440,000    
Sales Commission Percentage 4.00%    
Gain (Loss) on Disposition of Property Plant Equipment $ 516,651    
M/V RT Dagr [Member] | Eurochart [Member]      
Sales Commission Percentage 1.00%