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Note 8 - Employee Retirement Plans (Tables)
3 Months Ended
Mar. 31, 2024
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
  

Pension benefits

  

Postretirement benefits

 
  

Three months ended

  

Three months ended

 
  

March 31,

  

March 31,

 
  

2024

  

2023

  

2024

  

2023

 

Service cost

 $23  $23  $1  $1 

Interest cost

  46   45   5   6 

Expected return on plan assets

  (48)  (46)        

Amortization of actuarial net gain

          (5)  (5)

Amortization of prior service cost (credit)

  1   2   (2)  (1)

Total pension and postretirement benefit expense (income)

 $22  $24  $(1) $1