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Note 11 - Inventory (Tables)
6 Months Ended
Jul. 01, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
July
1
,
   
December 31,
 
   
201
8
   
201
7
 
   
(Unaudited)
   
 
 
 
                 
Raw materials
  $
11,077
    $
10,011
 
Work in process
   
6,413
     
7,150
 
Finished goods
   
1,257
     
1,645
 
Reserve for excess and obsolete inventory
   
(1,192
)    
(1,165
)
Total
  $
17,555
    $
17,641