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Note 11 - Accumulated Other Comprehensive Income (Loss) (AOCI) (Tables)
 6 Months Ended
Jun. 27, 2015
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
AOCI component
  
Balance at
December 27, 2014
   
Other
comprehensive
income (loss) activity
    
Reclassification
adjustment for
expense included
in net income
    
Balance at
June 27, 2015
  
                                 
Pension liability adjustment
(a)
   $ (29,615 )   $ (124 )   $ 1,971  
 
$
(27,768
)
Unrealized gain on investments
(b)
     10,791       3,336       —  
 
 
14,127
  
Foreign currency translation adjustment
     (2,302 )     (10,153 )     —  
 
 
(12,455
)
AOCI (loss) income
  $ (21,126 )   $ (6,941 )   $ 1,971  
 
$
(26,096
)