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Note 7 - Shareholders' Equity (Tables)
 3 Months Ended
Apr. 01, 2017
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
(in
thousands
)
 
Pension and postretirement liability and reclassification adjustments
(a)
 
 
Unrealized gains on investments
 
 
Foreign currency translation adjustment
 
 
Accumulated other comprehensive income (loss)
 
Balance at December 31, 2016
   $
(11,983
 )   $
10,769
     $
(73,365
 )   $
(74,579
 )
Activity in the period
    
(282
 )    
947
      
4,962
      
5,627
  
Balance at April 1, 2017
   $
(12,265
 )   $
11,716
     $
(68,403
 )   $
(68,952
 )