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Note 3 - Periodic Pension Expense (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
   
Three Months
   
Six Months
 
   
Ended June 30,
   
Ended June 30,
 
   
2019
   
2018
   
2019
   
2018
 
Service cost - benefits earned during the period
  $
29
    $
27
    $
58
    $
54
 
Interest cost on projected benefit obligation
   
271
     
243
     
542
     
485
 
Expected return on plan assets
   
(384
)    
(430
)    
(721
)    
(859
)
Recognized actuarial loss
   
324
     
283
     
649
     
566
 
Settlement loss
   
336
     
-
     
336
     
-
 
Net periodic pension cost
  $
576
    $
123
    $
864
    $
246