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Interest expense and finance costs
3 Months Ended
Mar. 31, 2017
Interest Expense And Finance Costs [Abstract]  
Interest expense and finance costs
4.
Interest expense and finance costs
 
 
 
Three months ended
 
 
 
Mar 31, 2017
 
Mar 31, 2016
 
Interest incurred
 
 
4,303,181
 
 
3,833,148
 
Amortization of deferred financing charges
 
 
607,740
 
 
600,463
 
 
 
 
4,910,921
 
 
4,433,611