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Note 8 - Stockholders' Equity (Tables)
6 Months Ended
Sep. 30, 2024
Notes Tables  
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, 2024

  76  $157.83   56  $240.96 

Awards granted(1)

  111   93.05   41   102.57 

Awards forfeited

  (4)  137.89   

-

   - 

Awards distributed

  (34)  165.50   -   - 

Outstanding as of September 30, 2024

  149  $108.40   97  $181.85 
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, 2024

  194  $181.89   3.2  $26 

Awards granted

  -   -         

Awards forfeited or expired

  (14)  147.90         

Awards exercised

  -   -         

Outstanding as of September 30, 2024

  180  $184.42   2.9  $229