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Note 8 - Stockholders' Equity (Tables)
6 Months Ended
Sep. 30, 2022
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended September 30,

  

Six Months Ended September 30,

 
  

2022

  

2021

  

2022

  

2021

 

Stock-based compensation expense

 $4,371  $2,039  $7,803  $4,236 

Amount of income tax (benefit) recognized in earnings

  (89)  (719)  (2,081)  (3,504)

Stock-based compensation expense, net of tax

 $4,282  $1,320  $5,722  $732 
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, 2022

  202  $167.14   2.9  $18,261 

Awards granted

  42   185.57         

Awards forfeited or expired

  (6)  227.42         

Awards exercised

  (42)  101.34         

Outstanding as of September 30, 2022

  196  $183.13   3.2  $1,978 
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, 2022(1)

  51  $252.86   55  $288.45 

Awards granted(1)

  39   187.44   19   172.15 

Performance adjustment(2)

  -   -   2   202.00 

Awards forfeited

  (5)  241.94   -   - 

Awards distributed(2)

  (24)  247.29   (10)  202.00 

Outstanding as of September 30, 2022(1)

  61  $214.47   66  $265.39