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Note 8 - Stockholders' Equity (Tables)
6 Months Ended
Sep. 30, 2023
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended September 30,

  

Six Months Ended September 30,

 
  

2023

  

2022

  

2023

  

2022

 

Stock-based compensation expense

 $3,183  $4,371  $6,151  $7,803 

Amount of income tax expense (benefit) recognized in earnings

  1,389   (89)  517   (2,081)

Stock-based compensation expense, net of tax

 $4,572  $4,282  $6,668  $5,722 
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, 2023

  163  $200.62   3.3  $1,643 

Awards granted

  53   131.67         

Awards forfeited or expired

  (15)  213.22         

Awards exercised

  (2)  132.40         

Outstanding as of September 30, 2023

  199  $181.90   3.7  $- 
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, 2023(1)

  57  $209.27   44  $286.02 

Awards granted(1)

  53   134.35   32   132.29 

Awards forfeited

  (3)  179.82   -   - 

Awards distributed

  (25)  208.33   -   - 

Outstanding as of September 30, 2023(1)

  82  $162.48   76  $223.07