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Note 10 - Guarantees (Tables)
12 Months Ended
Dec. 26, 2015
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
(in thousands)
 
2015
   
2014
   
2013
 
Beginning balance
  $ 5,848     $ 4,673     $ 4,206  
Warranty accruals
    6,747       6,176       4,814  
Warranty payments
    (7,709 )     (5,001 )     (6,180 )
Warranty liability assumed
    -       -       1,833  
Ending balance
  $ 4,886     $ 5,848     $ 4,673