Vessel Operating Expenses (Details) - USD ($)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Vessel Operating Expenses.
Crew wages and related costs	$ 43,724,030	$ 31,449,090	$ 14,529,018
Spares and stores	9,432,845	6,403,785	2,666,100
Insurance	4,668,838	3,527,386	1,343,071
Lubricants	2,742,944	2,489,494	964,951
Repairs and maintenance costs	3,867,993	2,076,576	1,315,028
Miscellaneous expenses	1,671,412	1,173,659	437,997
Total	$ 66,108,062	$ 47,119,990	$ 21,256,165