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Note 6 - Stockholders' Equity and Stock-based Compensation Expense (Tables)
3 Months Ended
Mar. 31, 2025
Notes Tables  
Share-Based Payment Arrangement, Activity [Table Text Block]
  

Stock Options

  

Performance Awards

 

Outstanding as of December 31, 2024

  4,463,028   7,142 

Options granted

      

Options exercised

  (225,209)   

Options forfeited/canceled

  (959,051)   

Outstanding as of March 31, 2025

  3,278,768   7,142 
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three months ended

 
  

March 31,

 
  

2025

  

2024

 

Research and development

 $2,372  $973 

General and administrative

  2,853   1,362 

Total stock-based compensation expense

 $5,225  $2,335