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Note 4 - Stock-based Compensation (Tables)
9 Months Ended
Dec. 31, 2025
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended December 31,

  

Nine Months Ended December 31,

 
  

2025

  

2024

  

2025

  

2024

 

Cost of revenues

 $269  $211  $875  $309 

Research and development

  504   442   1,703   697 

Selling, general and administrative

  3,049   2,208   9,536   3,927 

Total

 $3,822  $2,861  $12,114  $4,933 
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

Nine Months Ended December 31,

 
  

2025

 

Expected volatility

  74.01%

Risk-free interest rate

  4.19%

Expected life (years)

  6.31 

Dividend yield

 

None