Accrued Expenses (Details) - USD ($)	Mar. 31, 2019	Mar. 31, 2018
Accrued Expenses
Accrued voyage and vessel operating expenses	$ 1,684,336	$ 1,580,468
Accrued professional services	400,984	1,230,069
Accrued loan and swap interest	394,532	804,913
Accrued employee-related costs	867,514	992,427
Accrued board of directors' fees	88,750	88,750
Other		6,181
Total	$ 3,436,116	$ 4,702,808