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Note 10 - Inventory (Tables)
3 Months Ended
Apr. 01, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
April 1,
   
December 31,
 
   
2018
   
2017
 
   
(Unaudited)
   
 
 
 
                 
Raw materials
  $
9,633
    $
10,011
 
Work in process
   
6,509
     
7,150
 
Finished goods
   
1,563
     
1,645
 
Reserve for excess and obsolete inventory
   
(1,126
)    
(1,165
)
Total
  $
16,579
    $
17,641