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Capital leases (Details 1) - Capital Lease Obligations [Member] - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Capital Leased Assets [Line Items]    
2016 $ 27,164,804  
Total minimum lease payments 27,164,804  
Less amount representing interest (511,269)  
Less amounts representing deferred finance fees (414,282) $ (325,437)
Net minimum lease payments $ 26,239,253