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Note 8 - Guarantees and Other Obligations (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
Three Months Ended
    
Nine Months Ended
  
   
September 30,
    
September 24,
    
September 30,
    
September 24,
  
   
2017
    
2016
    
2017
    
2016
  
Balance at beginning of period
   $
5,070
     $
5,118
     $
4,350
     $
4,886
  
Warranty expense accruals
    
1,720
      
1,320
      
5,446
      
4,586
  
Warranty payments
    
(1,773
 )    
(1,401
 )    
(4,829
 )    
(4,435
 )
Warranty liability assumed
    
-
      
-
      
50
      
-
  
Balance at end of period
   $
5,017
     $
5,037
     $
5,017
     $
5,037