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Note 4 - Inventories (Tables)
3 Months Ended
Apr. 01, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
April
1
,
   
December 31,
 
   
2018
   
2017
 
Raw Materials
  $
15,234
    $
14,606
 
Work In Process
   
2,085
     
2,013
 
Finished Goods
   
9,642
     
9,707
 
Total
  $
26,961
    $
26,326