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Commitments and Contingencies (Details) - USD ($)
 3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Commitments under Contracts for Scrubber Purchases        
Less than one year $ 4,218,540   $ 4,218,540  
Total 4,218,540   4,218,540  
Operating Leases        
Operating lease rent expense 141,395 $ 120,010 391,411 $ 353,609
Commitments under Operating Leases        
Less than one year 531,200   531,200  
One to three years 395,592   395,592  
Total 926,792   926,792  
Time Charter-in        
Charter hire expenses 2,071,206   6,181,206  
Time Charter-in commitments        
Less than one year 8,370,000   8,370,000  
One to three years 1,400,000   1,400,000  
Total 9,770,000   9,770,000  
Fixed Time Charter Commitments        
Less than one year 16,675,858   16,675,858  
One to three years 31,125,000   31,125,000  
Total $ 47,800,858   $ 47,800,858