Revenues (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Revenues.
Net pool revenues—related party	$ 66,044,777		$ 130,701,023
Voyage charter revenues	15,567,844	$ 25,516,971	46,013,858	$ 47,444,311
Time charter revenues	11,237,746	6,965,705	26,169,581	20,713,290
Other revenues	433,341	101,314	988,138	638,440
Total revenues	93,283,708	32,583,990	203,872,600	68,796,041
Profit-sharing sharing revenue	$ 0	$ 2,400,000	$ 0	$ 7,800,000