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Note 4 - Stock-based Compensation (Tables)
6 Months Ended
Sep. 30, 2021
Notes Tables  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended September 30,

  

Six Months Ended September 30,

 
  

2021

  

2020

  

2021

  

2020

 

Cost of revenues

 $21  $30  $112  $59 

Research and development

  192   161   439   291 

Selling, general and administrative

  888   658   1,842   1,408 

Total

 $1,101  $849  $2,393  $1,758