Revenues (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues	$ 40,807,542		$ 68,451,824
Net pool revenue - related party
Revenues	32,027,042		48,133,443
Time charter revenue
Revenues	8,640,000		20,107,881
Other revenue, net
Revenues	$ 140,500		$ 210,500
Revenue Guidance in Effect before Topic 606
Revenues		$ 34,729,021		$ 75,754,493
Revenue Guidance in Effect before Topic 606 | Net pool revenue - related party
Revenues		20,468,380		48,943,739
Revenue Guidance in Effect before Topic 606 | Time charter revenue
Revenues		12,507,394		25,072,049
Revenue Guidance in Effect before Topic 606 | Voyage charter revenue
Revenues		1,733,247		1,733,247
Revenue Guidance in Effect before Topic 606 | Other revenue, net
Revenues		$ 20,000		$ 5,458