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Inventories (Tables)
12 Months Ended
Dec. 31, 2016
Inventories [Abstract]  
Schedule of Inventory, Current [Table Text Block]
 
 
December 31,
 
 
 
2016
 
2015
 
Raw materials and component parts
 
$
36,821
 
$
30,569
 
Finished goods
 
 
60,156
 
 
67,777
 
 
 
$
96,977
 
$
98,346