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Note 18 - Post-retirement Benefits (Tables)
9 Months Ended
Sep. 30, 2022
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
  

Three Months Ended September 30,

  

Nine Months Ended September 30,

 
  

2022

  

2021

  

2022

  

2021

 
                 

Amortization of prior service credit

 $61  $61  $183  $183 

Interest cost

  (958)  (823)  (3,003)  (2,500)

Expected return on plan assets

  1,313   1,148   4,116   3,479 

Total

 $416  $386  $1,296  $1,162