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Note 7 - Pension and Other Postretirement Benefits (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Costs of Retirement Plans [Table Text Block]
  

Pension Benefits

  

Postretirement Benefits

 
  

Three Months Ended
March 31,

  

Three Months Ended
March 31,

 
  

2021

  

2020

  

2021

  

2020

 

Service cost

 $749  $684  $365  $343 

Interest cost

  392   535   163   194 

Expected return on plan assets

  (895)  (985

)

  -   - 

Amortization of prior service cost

  -   -   (282)  (282

)

Recognized actuarial loss

  515   513   145   77 

Settlement loss

  -   1,478   -   - 

Net periodic benefit cost (a)

 $761  $2,225  $391  $332