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Note 7 - Pension and Other Postretirement Benefits (Tables)
3 Months Ended
Mar. 31, 2023
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,

 
   

2023

   

2022

   

2023

   

2022

 

Service cost

  $ 530     $ 664     $ 208     $ 287  

Interest cost

    635       454       299       190  

Expected return on plan assets

    (657 )     (812 )     -       -  

Amortization of prior service cost

    -       -       (248 )     (283 )

Recognized actuarial loss

    301       454       (9 )     92  

Net periodic benefit cost (a)

  $ 809     $ 760     $ 250     $ 286