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Note 7 - Stockholders' Equity (Tables)
3 Months Ended
Jun. 30, 2021
Notes Tables  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended June 30,

 
  

2021

  

2020

 

Stock-based compensation expense

 $2,197  $1,268 

Amount of income tax (benefit) recognized in earnings

  (2,785)  (925)

Stock-based compensation expense, net of tax

 $(588) $343 
Share-based Payment Arrangement, Option, Activity [Table Text Block]
  

Stock Options

 
  

Shares Subject to Options

  

Weighted- Average Exercise Price per Share

  

Weighted-Average Remaining Contractual Life (Years)

  

Aggregate Intrinsic Value

 

Outstanding as of March 31, 2021

  253  $129.55   2.7  $28,856 

Awards granted

  -   -         

Awards forfeited or expired

  (2)  170.93         

Awards exercised or distributed

  (19)  96.18         

Outstanding as of June 30, 2021

  232  $131.90   2.5  $32,299 
Share-based Payment Arrangement, Activity [Table Text Block]
  

Time-Based Restricted Stock Units

  

Performance-Based Restricted Stock Units

 
  

Number of Shares

  

Weighted- Average Grant Date Fair Value per Share

  

Number of Shares

  

Weighted- Average Grant Date Fair Value per Share

 

Outstanding as of March 31, 2021(1)

  37  $206.56   20  $207.88 

Awards granted

  -   -   -    

Performance adjustment(2)

  -   -   16   190.07 

Awards forfeited

  (1)  205.19   -    

Awards distributed

  (14)  214.91   (28)  197.81 

Outstanding as of June 30, 2021(1)

  22  $201.50   8  $202.00