Accrued Expenses (Details) - USD ($)	Mar. 31, 2018	Mar. 31, 2017
Accrued Expenses
Accrued voyage and vessel operating expenses	$ 1,580,468	$ 2,029,598
Accrued professional services	1,230,069	1,470,298
Accrued loan and swap interest	804,913	999,733
Accrued employee-related costs	992,427	786,467
Accrued board of directors' fees	88,750	88,750
Other	6,181	11,551
Total	$ 4,702,808	$ 5,386,397