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Note 4 - Inventories (Tables)
9 Months Ended
Oct. 01, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
October 1,
   
December 31,
 
   
201
7
   
201
6
 
Raw
Materials
  $
12,939
    $
14,482
 
Work
In Process
   
1,871
     
986
 
Finished
Goods
   
10,112
     
7,988
 
Total
  $
24,922
    $
23,456