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Note 12 - Guarantees (Tables)
 6 Months Ended
Jun. 29, 2019
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
Three Months Ended
    
Six Months Ended
  
   
June 29,
    
June 30,
    
June 29,
    
June 30,
  
   
2019
    
2018
    
2019
    
2018
  
Balance at beginning of period
   $
7,088
     $
4,916
     $
8,014
     $
4,848
  
Warranty expense accruals
    
1,830
      
1,806
      
3,558
      
3,388
  
Warranty payments
    
(2,066
 )    
(1,774
 )    
(4,720
 )    
(3,288
 )
Balance at end of period
   $
6,852
     $
4,948
     $
6,852
     $
4,948