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Note 7 - Shareholders' Equity (Tables)
 6 Months Ended
Jul. 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
g
ain
s
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
    
(381
 )    
475
      
1,381
      
1,475
  
Balance at
July 1, 2017
   $
(12,364
 )   $
11,244
     $
(71,984
 )   $
(73,104
 )