Revenues (Details) - USD ($)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Revenues	$ 158,032,485
Net pool revenue - related party
Revenues	120,015,771
Time charter revenue
Revenues	37,726,214
Other revenues, net
Revenues	$ 290,500
Revenue Guidance in Effect before Topic 606
Revenues		$ 159,334,760	$ 167,447,171
Revenue Guidance in Effect before Topic 606 | Net pool revenue - related party
Revenues		106,958,576	115,753,153
Revenue Guidance in Effect before Topic 606 | Time charter revenue
Revenues		50,176,166	49,474,510
Revenue Guidance in Effect before Topic 606 | Voyage charter revenue
Revenues		2,068,491	1,296,952
Revenue Guidance in Effect before Topic 606 | Other revenues, net
Revenues		$ 131,527	$ 922,556