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Note 4 - Stock-based Compensation (Tables)
6 Months Ended
Sep. 30, 2024
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended September 30,

  

Six Months Ended September 30,

 
  

2024

  

2023

  

2024

  

2023

 

Cost of revenues

 $39  $59  $97  $169 

Research and development

  113   156   256   311 

Selling, general and administrative

  691   896   1,719   1,988 

Total

 $843  $1,111  $2,072  $2,468