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Note 7 - Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 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
/(loss)
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
    
(441
 )    
(1,235
 )    
2,912
      
1,236
  
Balance at
September 30, 2017
   $
(12,424
 )   $
9,534
     $
(70,453
 )   $
(73,343
 )