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Commitments and contingencies (Tables)
12 Months Ended
Dec. 31, 2014
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, 2014 are as follows:
 
2015
 
$
728,452
 
2016
 
 
554,055
 
2017
 
 
512,094
 
2018
 
 
504,774
 
2019
 
 
314,233
 
Thereafter
 
 
2,818,489
 
 
 
$
5,432,097