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Note 18 - Post-retirement Benefits (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
  

Three Months Ended March 31,

 
  

2022

  

2021

 
         

Amortization of prior service credit

 $61  $61 

Interest cost

  (1,054)  (837)

Expected return on plan assets

  1,428   1,181 

Total

 $435  $405