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16. Geographic area information (Tables)
12 Months Ended
Dec. 31, 2012
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
   
Year Ended December 31,
 
(In thousands)
 
2012
   
2011
   
2010
 
Net sales:
                 
United States
  $ 49,932     $ 49,301     $ 44,101  
International
    18,454       16,668       19,093  
Total
  $ 68,386     $ 65,969     $ 63,194  
                         
Fixed assets, net:
                       
United States
  $ 1,941     $ 2,129     $ 2,694  
International
    1,361       1,229       1,377  
Total
  $ 3,302     $ 3,358     $ 4,071