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Note 3 - Share-based Compensation (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended

September 30,

  

Nine Months Ended

September 30,

 
  

2021

  

2020

  

2021

  

2020

 

Restricted share units:

 

Pretax compensation expense

 $11,677  $11,250  $34,669  $38,358 

Tax benefit

  2,931   2,880   8,702   9,820 

Restricted share unit expense, net of tax

 $8,746  $8,370  $25,967  $28,538 

Performance share units:

 

Pretax compensation expense

 $4,269  $3,344  $12,742  $10,300 

Tax benefit

  1,071   856   3,198   2,637 

Performance share unit expense, net of tax

 $3,198  $2,488  $9,544  $7,663