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Interest expense and finance costs (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Interest Expense And Finance Costs [Line Items]    
Interest incurred $ 6,442,772 $ 5,109,737
Amortization of deferred finance charges 514,888 592,254
Interest expense and finance costs $ 6,957,660 $ 5,701,991