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Commitments and Contingencies (Details) - USD ($)
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Operating Leases    
Operating lease rent expense $ 127,482 $ 106,192
Commitments under Operating Leases    
Less than one year 466,647  
One to three years 483,459  
Three to five years 393,715  
Total 1,343,821  
Fixed Time Charter Contracts    
Less than one year 32,713,113  
One to three years 17,666,365  
Total $ 50,379,478