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

Three Months Ended June 30,

  

Six Months Ended June 30,

 
  

2023

  

2022

  

2023

  

2022

 

Service cost on benefits earned during the period

 $-  $51  $21  $102 

Interest cost on projected benefit obligation

  159   100   318   200 

Recognized actuarial loss

  55   428   110   856 

Net periodic pension cost

 $214  $579  $449  $1,158