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Note 3 - Periodic Pension Expense (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
   
2018
   
2017
 
Service cost - benefits earned during the period
  $
27
    $
16
 
Interest cost on projected benefit obligation
   
242
     
241
 
Expected return on plan assets
   
(429
)    
(304
)
Recognized actuarial loss
   
283
     
277
 
Net periodic pension cost
  $
123
    $
230