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Note 3 - Periodic Pension Expense (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
(In thousands)
                               
                                 
   
Three Months
   
Six Months
 
   
Ended June 30,
   
Ended June 30,
 
   
2018
   
2017
   
2018
   
2017
 
Service cost - benefits earned during the period
  $
27
    $
16
    $
54
    $
32
 
Interest cost on projected benefit obligation
   
243
     
242
     
485
     
483
 
Expected return on plan assets
   
(430
)    
(305
)    
(859
)    
(609
)
Recognized actuarial loss
   
283
     
270
     
566
     
547
 
Settlement loss
   
-
     
277
     
-
     
277
 
Net periodic pension cost
  $
123
    $
500
    $
246
    $
730