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Inventories: (Tables)
6 Months Ended
Jun. 30, 2011
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventories consisted of the following:
 
 
June 30, 2011
 
December 31, 2010
Raw material
$
26,270


 
$
22,805


Work in process
4,224


 
3,806


Finished goods
18,878


 
17,445


Total
$
49,372


 
$
44,056