v3.26.1
Note 6 - Stockholders' Equity and Stock-based Compensation Expense (Tables)
3 Months Ended
Mar. 31, 2026
Notes Tables  
Share-Based Payment Arrangement, Activity [Table Text Block]
   

Stock Options

   

Performance Awards

 

Outstanding as of December 31, 2025

    4,157,094       7,142  

Options granted

           

Options exercised

           

Options forfeited/canceled

           

Outstanding as of March 31, 2026

    4,157,094       7,142  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
   

Three months ended

 
   

March 31,

 
   

2026

   

2025

 

Research and development

  $ 1,333     $ 2,372  

General and administrative

    2,736       2,853  

Total stock-based compensation expense

  $ 4,069     $ 5,225