Vessels, Net (Details)	12 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($) item	Mar. 31, 2015 USD ($)
Accumulated depreciation
Vessels, net	$ 1,603,469,247	$ 1,667,224,476
Vessels
Cost
Balance at the beginning of the period	1,727,979,929	439,180,669
Vessels delivered		1,292,872,267
Other additions	984,639	195,272
Transfers out	(195,273)
Disposals		(4,268,279)
Balance at the end of the period	1,728,769,295	1,727,979,929
Accumulated depreciation
Balance at the beginning of the period	(60,755,453)	(19,204,616)
Disposals accumulated depreciation		429,214
Disposals net book value		(3,839,065)
Depreciation	(64,544,595)	(41,980,051)
Balance at the end of the period	(125,300,048)	(60,755,453)
Vessels, net	1,603,469,247	$ 1,667,224,476	$ 419,976,053
Number of vessels with capital improvements | item		2
Mortgaged VLGC vessels, carrying value	$ 1,603,500,000	$ 1,667,200,000