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Note I - Pension and Other Post-retirement Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2024
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
  

Three Months Ended March 31,

 
  

Pension Plans

  

Post-Retirement Healthcare Plan

 
  

2024

  

2023

  

2024

  

2023

 

Service cost

 $  $  $5  $13 

Interest cost

  6,614   8,631   23   33 

Expected return on plan assets

  (8,122)  (10,192)      

Amortization of net loss

  2,594   4,745   (23)   

Net periodic benefit cost (income)

 $1,086  $3,184  $5  $46