Revenues (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues.
Net pool revenues-related party	$ 49,345,687		$ 64,656,246
Voyage charter revenues	15,581,830	$ 13,738,052	30,446,014	$ 21,927,340
Time charter revenues	9,559,631	6,373,220	14,931,835	13,747,585
Other revenues	459,284	246,939	554,797	537,126
Total revenues	74,946,432	20,358,211	110,588,892	36,212,051
Profit-sharing sharing revenue	$ 0	$ 2,200,000	$ 0	$ 5,300,000