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Note 7 - Pension and Other Postretirement Benefits (Tables)
3 Months Ended
Mar. 31, 2022
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,

 
  

2022

  

2021

  

2022

  

2021

 

Service cost

 $664  $749  $287  $365 

Interest cost

  454   392   190   163 

Expected return on plan assets

  (812)  (895

)

  -   - 

Amortization of prior service cost

  -   -   (283

)

  (282

)

Recognized actuarial loss

  454   515   92   145 

Net periodic benefit cost (a)

 $760  $761  $286  $391