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Vessels, Net (Details)
 9 Months Ended
Dec. 31, 2019
USD ($)
item
Mar. 31, 2019
USD ($)
Vessels, Net    
Vessels, net $ 1,447,166,072 $ 1,478,520,314
Vessels    
Cost    
Balance at the beginning of the period 1,732,993,810  
Other additions 17,460,014  
Balance at the end of the period 1,750,453,824  
Accumulated depreciation    
Balance at the beginning of the period (254,473,496)  
Impairment 0  
Depreciation (48,814,256)  
Balance at the end of the period $ (303,287,752)  
Number of VLGCs with scrubber purchase commitments | item 10  
Mortgaged VLGC vessels, carrying value $ 1,447,200,000 $ 1,478,500,000