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Interest expense and finance costs (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Interest Expense And Finance Costs [Line Items]      
Interest incurred $ 3,833,148 $ 2,384,806  
Capitalized interest 0 (1,076,212)  
Amortization of deferred financing charges 600,463 301,175 $ 301,175
Interest expense and finance costs $ 4,433,611 $ 1,609,769 $ 1,609,769