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Note 18 - Post-retirement Benefits (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

 
                 

Amortization of prior service credit

 $61  $61  $122  $122 

Interest cost

  (1,551)  (991)  (3,084)  (2,045)

Expected return on plan assets

  1,007   1,375   1,993   2,803 

Total

 $(483) $445  $(969) $880