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Note 12 - Guarantees (Tables)
 12 Months Ended
Dec. 28, 2019
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
(in thousands)
  
2019
    
2018
    
2017
  
Beginning balance
   $
8,014
     $
4,849
     $
4,350
  
Warranty accruals
    
6,714
      
7,154
      
6,765
  
Warranty payments
    
(8,573
 )    
(8,358
 )    
(6,316
 )
Warranty liability assumed
    
-
      
4,369
      
50
  
Ending balance
   $
6,155
     $
8,014
     $
4,849