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Note 8 - Guarantees and Other Obligations (Tables)
 6 Months Ended
Jun. 24, 2017
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
Three Months Ended
    
Six Months Ended
  
   
June 24,
    
June 25,
    
June 24,
    
June 25,
  
   
2017
    
2016
    
2017
    
2016
  
Balance at beginning of period
   $
4,945
     $
5,218
     $
4,350
     $
4,886
  
Warranty expense accruals
    
1,990
      
1,446
      
3,726
      
3,266
  
Warranty payments
    
(1,865
 )    
(1,546
 )    
(3,056
 )    
(3,034
 )
Warranty liability assumed
    
-
      
-
      
50
      
-
  
Balance at end of period
   $
5,070
     $
5,118
     $
5,070
     $
5,118