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Note 8 - Stockholders' Equity (Tables)
3 Months Ended
Jun. 30, 2020
Notes Tables  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended June 30,

 
  

2020

  

2019

 

Stock-based compensation expense

 $1,268  $868 

Amount of income tax (benefit) recognized in earnings

  (925)  (540)

Stock-based compensation expense, net of tax

 $343  $328 
Share-based Payment Arrangement, Option, Activity [Table Text Block]
  

Stock Options

 
  

Shares Subject to Options

  

Weighted- Average Exercise Price per Share

 

Outstanding at March 31, 2020

  286  $107.72 

Awards granted

  36   226.72 

Awards forfeited or expired

  (10)  112.93 

Awards exercised

  (23)  78.31 

Outstanding as of June 30, 2020

  289  $124.74 
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

 

Nonvested at March 31, 2020

  28  $180.15   22  $204.68 

Awards granted

  19   225.28   -   - 

Awards forfeited or expired

  (1)  191.65   (1)  199.50 

Awards distributed

  (4)  180.59   -   - 

Nonvested as of June 30, 2020

  42  $200.68   21  $204.80