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Commitments and contingencies (Tables)
12 Months Ended
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Future minimum lease payments under these non-cancellable operating leases as of December 31, 2015 are as follows:
 
2016
 
$
717,874
 
2017
 
 
740,778
 
2018
 
 
753,303
 
2019
 
 
590,130
 
2020
 
 
490,244
 
Thereafter
 
 
3,160,724
 
 
 
$
6,453,053