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Note 9 - Guarantees (Tables)
 12 Months Ended
Dec. 30, 2017
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
(in thousands)
  
2017
    
2016
    
2015
  
Beginning balance
   $
4,350
     $
4,886
     $
5,848
  
Warranty accruals
    
6,765
      
6,088
      
6,747
  
Warranty payments
    
(6,316
 )    
(6,624
 )    
(7,709
 )
Warranty liability assumed
    
50
      
-
      
-
  
Ending balance
   $
4,849
     $
4,350
     $
4,886