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

Three Months Ended June 30,

  

Six Months Ended June 30,

 
  

2022

  

2021

  

2022

  

2021

 
                 

Amortization of prior service credit

 $61  $61  $122  $122 

Interest cost

  (991)  (840)  (2,045)  (1,677)

Expected return on plan assets

  1,375   1,150   2,803   2,331 

Total

 $445  $371  $880  $776