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Note 7 - Stockholders' Equity (Tables)
9 Months Ended
Dec. 31, 2021
Notes Tables  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended December 31,

  

Nine Months Ended December 31,

 
  

2022

  

2021

  

2021

  

2020

 

Stock-based compensation expense

 $3,703  $3,611  $7,939  $6,887 

Amount of income tax (benefit) expense recognized in earnings

  (743)  320   (4,247)  (1,127)

Stock-based compensation expense, net of tax

 $2,960  $3,931  $3,692  $5,760 
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

  37   268.85         

Awards forfeited or expired

  (4)  191.52         

Awards exercised

  (62)  98.99         

Outstanding as of December 31, 2021

  224  $159.79   2.8  $37,597 
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 (1)

  37   274.83   47   302.15 

Performance adjustment(2)

  -   -   16   190.07 

Awards forfeited

  (2)  224.66   -   - 

Awards distributed

  (20)  207.98   (28)  197.81 

Outstanding as of December 31, 2021(1)

  52  $253.59   55  $288.45