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Note 6 - Pension and Other Postretirement Benefits (Tables)
3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Costs of Retirement Plans [Table Text Block]
 
 
Pension Benefits
 
 
Postretirement Benefits
 
 
 
Three Months Ended
March 31,
 
 
Three Months Ended
March 31,
 
 
 
2017
 
 
2016
 
 
2017
 
 
2016
 
Service cost
  $
752
    $
709
    $
312
    $
298
 
Interest cost
   
668
     
661
     
203
     
210
 
Expected return on plan assets
   
(1,196
)
   
(982
)
   
-
     
-
 
Recognized actuarial loss (gain)
   
490
     
525
     
(168
)
   
(174
)
Settlement loss
   
1,680
     
-
     
-
     
-
 
Net periodic benefit cost
  $
2,394
    $
913
    $
347
    $
334