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Note 8 - Stockholders' Equity (Tables)
9 Months Ended
Dec. 31, 2022
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

  

2022

  

2021

 

Stock-based compensation expense

 $2,056  $3,703  $9,859  $7,939 

Amount of income tax (benefit) recognized in earnings

  226   (743)  (1,855)  (4,247)

Stock-based compensation expense, net of tax

 $2,282  $2,960  $8,004  $3,692 
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

  43   185.61         

Awards forfeited or expired

  (7)  225.12         

Awards exercised

  (45)  100.19         

Outstanding as of December 31, 2022

  193  $184.70   3.1  $3,406 
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)

  42   187.45   19   179.63 

Performance adjustment(2)

  -   -   2   202.00 

Awards forfeited

  (8)  232.20   -   - 

Awards distributed(2)

  (26)  250.81   (10)  202.00 

Outstanding as of December 31, 2022(1)

  59  $210.44   66  $267.97