Vessels, Net (Details)	9 Months Ended
	Dec. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($)	Mar. 31, 2016 USD ($)
Cost
Additions	$ 984,639
Transfers out	(195,273)
Impairment	0	$ 0
Accumulated depreciation
Depreciation	(48,621,720)
Vessels, net	1,619,392,122		$ 1,667,224,476
Mortgaged VLGC vessels, carrying value	1,619,400,000		$ 1,667,200,000
Vessels
Cost
Balance at the beginning of the period	1,727,979,929
Additions	984,639
Transfers out	(195,273)
Balance at the end of the period	1,728,769,295
Accumulated depreciation
Balance at the beginning of the period	(60,755,453)
Depreciation	(48,621,720)
Balance at the end of the period	$ (109,377,173)
Number of vessels with capital improvements | item	2