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Interest expense and finance costs (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Interest Expense And Finance Costs [Line Items]    
Interest incurred $ 4,303,181 $ 3,833,148
Amortization of deferred financing charges 607,740 600,463
Interest expense and finance costs $ 4,910,921 $ 4,433,611