Voyage Expenses (Details) - USD ($)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Voyage Expenses.
Bunkers	$ 804,371	$ 7,240,544	$ 15,678,905
Port charges and other related expenses	886,651	2,558,697	3,603,707
Brokers' commissions	684,302	1,335,584	1,703,589
Security cost	390,330	370,762	709,035
War risk insurances	40,704	219,261	146,320
Other voyage expenses	159,620	339,834	240,300
Total voyage expenses	$ 2,965,978	$ 12,064,682	$ 22,081,856