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Commitments and Contingencies (Details) - USD ($)
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Operating Leases      
Operating lease rent expense $ 415,928 $ 451,240 $ 249,331
Commitments under Operating Leases      
Less than one year 378,679    
One to three years 154,629    
Total 533,308    
Fixed time charter      
Fixed Time Charter Contracts      
Less than one year 48,598,113    
One to three years 56,311,227    
Three to five years 5,828,252    
Total $ 110,737,592