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Note 4 - Inventories (Tables)
3 Months Ended
Apr. 02, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
 
 
April 2,
 
 
December 31,
 
 
 
2017
 
 
2016
 
Raw materials
  $
13,157
    $
14,482
 
Work in process
   
1,427
     
986
 
Finished goods
   
8,145
     
7,988
 
Total
  $
22,729
    $
23,456