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Leases
12 Months Ended
Dec. 31, 2014
Leases [Abstract]  
Leases of Lessee Disclosure [Text Block]
10. Leases
 
Future minimum lease payments for noncancellable operating leases as of December 31, 2014, are as follows:
 
2015
 
$
731,555
 
2016
 
 
154,663
 
2017
 
 
158,474
 
2018
 
 
26,677
 
2019
 
 
—
 
Thereafter
 
 
—
 
Total minimum lease payments
 
$
1,071,369
 
 
Rent expense for operating leases was $512,855, $784,531 and $866,768 for the years ended December 31, 2012, 2013 and 2014, respectively.