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Inventories (Tables)
3 Months Ended
Mar. 31, 2014
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventories consist of the following (in thousands):
 
March 31,
2014
 
December 31,
2013
 
 
 
 
Purchased materials
$
1,261

 
$
1,343

Finished goods
4,357

 
5,102

 
$
5,618

 
$
6,445