Revenues (Details) - USD ($)	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Revenues	$ 27,644,282
Net pool revenue - related party
Revenues	16,106,401
Time charter revenue
Revenues	11,467,881
Other revenue, net
Revenues	$ 70,000
Revenue Guidance in Effect before Topic 606
Revenues		$ 41,025,472
Revenue Guidance in Effect before Topic 606 | Net pool revenue - related party
Revenues		28,475,359
Revenue Guidance in Effect before Topic 606 | Time charter revenue
Revenues		12,564,655
Revenue Guidance in Effect before Topic 606 | Other revenue, net
Revenues		$ (14,542)