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Note 4 - Stock-based Compensation (Tables)
9 Months Ended
Dec. 31, 2024
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended December 31,

  

Nine Months Ended December 31,

 
  

2024

  

2023

  

2024

  

2023

 

Cost of revenues

 $211  $62  $309  $230 

Research and development

  442   158   697   469 

Selling, general and administrative

  2,208   920   3,927   2,909 

Total

 $2,861  $1,140  $4,933  $3,608