v3.25.2
Note 2 - Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2025
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
   

Three Months Ended

   

Six Months Ended

 
   

June 30,

   

June 30,

 
   

2025

   

2024

   

2025

   

2024

 

Research and development

  $ 19     $ 242     $ 2,680     $ 496  

General and administrative

    88       137       756       264  

Total share-based compensation expense

  $ 107     $ 379     $ 3,436     $ 760  
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   

Three Months Ended

    Six Months Ended  
    June 30,     June 30,  
   

2025

    2024    

2025

   

2024

 

Dividend yield

    -       -       -       -  

Expected volatility

    -       79%-80 %     79%-80 %     79%-80 %

Risk-free interest rate

    -       4.2%-4.4 %     4.1%-4.5 %     3.8%-4.4 %

Expected life (in years)

    -       5.38- 6.25       6.25 - 10       5.38- 6.25  

Weighted-average grant date fair value per share

  $ -     $ 3.84     $ 2.93     $ 3.85