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Commitments and contingencies (Tables)
12 Months Ended
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Future minimum lease payments under these non-cancelable operating leases as of December 31, 2013 are as follows:
 
2014
 
$
566,721
 
2015
 
 
461,147
 
2016
 
 
294,408
 
2017
 
 
247,192
 
2018
 
 
247,192
 
Thereafter
 
 
3,419,487
 
 
 
$
5,236,147