Accrued Expenses (Details) - USD ($)	Mar. 31, 2017	Mar. 31, 2016
Accrued Expenses
Accrued voyage and vessel operating expenses	$ 2,029,598	$ 1,644,557
Accrued professional services	1,470,298	1,676,880
Accrued loan and swap interest	999,733	1,664,002
Accrued employee-related costs	786,467	4,231,542
Accrued board of directors' stock-based compensation and fees	88,750	492,652
Other	11,551	11,844
Total	$ 5,386,397	$ 9,721,477