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Note 4 - Discontinued Operations (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Disposal Groups, Including Discontinued Operations [Table Text Block]
   
December 31,
    
December 26,
    
December 27,
  
   
2016
   
2015
   
2014
 
                         
Net sales:
                        
Microwave equipment segment
   $
-
     $
6,965
     $
16,694
  
Video camera segment
    
-
      
-
      
5,460
  
    $
-
     $
6,965
     $
22,154
  
                         
Operating loss before income taxes:
                        
Microwave equipment segment
   $
-
     $
(1,963
 )   $
(10,305
 )
Video camera segment
    
-
      
-
      
(242
 )
     
-
      
(1,963
 )    
(10,547
 )
Loss from sale of BMS
    
(221
 )    
(3,573
 )    
-
  
Gain from sale of Cohu Electronics
    
-
      
-
      
4,434
  
Loss before taxes
    
(221
 )    
(5,536
 )    
(6,113
 )
Income tax provision
    
-
      
6
      
(41
 )
Loss, net of tax
   $
(221
 )   $
(5,542
 )   $
(6,072
 )