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Vessels, Net (Details) - USD ($)
 6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Mar. 31, 2016
Cost      
Additions $ 287,962    
Transfers out (195,273)    
Impairment 0 $ 0  
Accumulated depreciation      
Depreciation (32,357,033)    
Vessels, net 1,634,960,132   $ 1,667,224,476
Mortgaged VLGC vessels, carrying value 1,635,000,000   $ 1,667,200,000
Vessels      
Cost      
Balance at the beginning of the period 1,727,979,929    
Additions 287,962    
Transfers out (195,273)    
Balance at the end of the period 1,728,072,618    
Accumulated depreciation      
Balance at the beginning of the period (60,755,453)    
Depreciation (32,357,033)    
Balance at the end of the period $ (93,112,486)