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Inventory (Tables)
3 Months Ended
Mar. 31, 2013
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Our inventory, net of allowance for obsolescence of $258,000 at March 31, 2013 and $211,000 at December 31, 2012, consisted of the following amounts:
 
March 31, 2013
 
December 31, 2012
 
(in thousands)
Raw materials
$
19,723

 
$
19,654

Work in process
5,044

 
6,855

 
$
24,767

 
$
26,509