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Note 11 - Guarantees (Tables)
 12 Months Ended
Dec. 29, 2018
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
(in thousands)
  
2018
    
2017
    
2016
  
Beginning balance
   $
4,849
     $
4,350
     $
4,886
  
Warranty accruals
    
7,154
      
6,765
      
6,088
  
Warranty payments
    
(8,358
 )    
(6,316
 )    
(6,624
 )
Warranty liability assumed
    
4,369
      
50
      
-
  
Ending balance
   $
8,014
     $
4,849
     $
4,350