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Note 4 - Periodic Pension Cost (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
  

Three Months Ended September 30,

  

Nine Months Ended September 30,

 
  

2023

  

2022

  

2023

  

2022

 

Service cost on benefits earned during the period

 $-  $51  $21  $153 

Interest cost on projected benefit obligation

  159   100   477   300 

Recognized actuarial loss

  55   428   165   1,284 

Net periodic pension cost

 $214  $579  $663  $1,737