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Note 4 - Periodic Pension Expense (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
       
  

Three Months Ended June 30,

  

Six Months Ended June 30,

 
  

2020

  

2019

  

2020

  

2019

 

Service cost - benefits earned during the period

 $38  $29  $76  $58 

Interest cost on projected benefit obligation

  216   271   432   542 

Expected return on plan assets

  (389)  (384)  (778)  (721)

Recognized actuarial loss

  313   324   633   649 

Settlement loss

  193   336   331   336 

Net periodic pension cost after settlements

 $371  $576  $694  $864