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Note 4 - Periodic Pension Expense (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
       
   
Three Months Ended March 31,
 
   
2020
   
2019
 
Service cost - benefits earned during the period
  $
38
    $
29
 
Interest cost on projected benefit obligation
   
216
     
271
 
Expected return on plan assets
   
(389
)    
(337
)
Recognized actuarial loss
   
320
     
325
 
Settlement loss
   
138
     
-
 
Net periodic pension cost after settlements
  $
323
    $
288