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Note 3 - Stock-based Compensation (Tables)
6 Months Ended
Sep. 30, 2023
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended September 30,

  

Six Months Ended September 30,

 
  

2023

  

2022

  

2023

  

2022

 

Cost of revenues

 $59  $78  $169  $107 

Research and development

  156   177   311   355 

Selling, general and administrative

  896   764   1,988   1,590 

Total

 $1,111  $1,019  $2,468  $2,052 
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block]

Expected volatility

  71.40%

Risk-free interest rate

  3.10%

Expected life (years)

  6.14 

Dividend yield

 

None