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

Three Months Ended June 30,

 
  

2023

  

2022

 

Cost of revenues

 $109  $29 

Research and development

  156   179 

Selling, general and administrative

  1,092   825 

Total

 $1,357  $1,033 
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