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Note 7 - Stockholders' Equity and Stock-based Compensation Expense (Tables)
9 Months Ended
Sep. 30, 2024
Notes Tables  
Share-Based Payment Arrangement, Activity [Table Text Block]
  

Stock Options

  

Performance Awards

 

Outstanding as of December 31, 2023

  3,039,029   7,142 

Options granted

  1,273,000    

Options exercised

      

Options forfeited/canceled

  (208,000)   

Outstanding as of September 30, 2024

  4,104,029   7,142 
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three months ended

  

Nine months ended

 
  

September 30,

  

September 30,

 
  

2024

  

2023

  

2024

  

2023

 

Research and development

 $1,675  $405  $3,620  $1,186 

General and administrative

  3,934   544   6,927   1,271 

Total stock-based compensation expense

 $5,609  $949  $10,547  $2,457