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Note 6 - Discontinued Operations (Tables)
 6 Months Ended
Jun. 24, 2017
Notes Tables  
Disposal Groups, Including Discontinued Operations [Table Text Block]
   
Three Months Ended
    
Six Months Ended
  
   
June 24,
    
June 25,
    
June 24,
    
June 25,
  
   
2017
    
2016
    
2017
    
2016
  
                                 
Net sales
   $
-
     $
-
     $
-
     $
-
  
                                 
Operating loss before income taxes
    
-
      
-
      
-
      
-
  
Loss from sale of BMS
    
(278
 )    
(55
 )    
(278
 )    
(55
 )
Loss before taxes
    
(278
 )    
(55
 )    
(278
 )    
(55
 )
Income tax provision
    
-
      
-
      
-
      
-
  
Loss, net of tax
   $
(278
 )   $
(55
 )   $
(278
 )   $
(55
 )