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Note 3 - Periodic Pension Expense (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
   
Three Months
   
Nine Months
 
   
Ended September 30,
   
Ended September 30,
 
   
2019
   
2018
   
2019
   
2018
 
Service cost - benefits earned during the period   $
29
    $
27
    $
87
    $
81
 
Interest cost on projected benefit obligation    
271
     
242
     
813
     
727
 
Expected return on plan assets    
(385
)    
(429
)    
(1,106
)    
(1,288
)
Recognized actuarial loss    
310
     
284
     
959
     
850
 
Settlement loss    
280
     
-
     
616
     
-
 
Net periodic pension cost
  $
505
    $
124
    $
1,369
    $
370