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Note 7 - Guarantees and Other Obligations (Tables)
 9 Months Ended
Sep. 29, 2018
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
Three Months Ended
    
Nine Months Ended
  
   
September 29,
    
September 30,
    
September 29,
    
September 30,
  
   
2018
    
2017
    
2018
    
2017
  
Balance at beginning of period
   $
4,948
     $
5,070
     $
4,848
     $
4,350
  
Warranty expense accruals
    
1,600
      
1,720
      
4,988
      
5,446
  
Warranty payments
    
(1,946
 )    
(1,773
 )    
(5,234
 )    
(4,829
 )
Warranty liability assumed
    
-
      
-
      
-
      
50
  
Balance at end of period
   $
4,602
     $
5,017
     $
4,602
     $
5,017