v3.26.1
Note 2 - Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2026
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
   

Three Months Ended

 
   

March 31,

 
   

2026

   

2025

 

Research and development

  $ 8     $ 2,661  

General and administrative

    164       668  

Total share-based compensation expense

  $ 172     $ 3,329  
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   

Three Months Ended

 
    March 31,  
   

2026

   

2025

 

Dividend yield

    -       -  

Expected volatility

    81%-82 %     79%-80 %

Risk-free interest rate

    3.8%-4.0 %     4.1%-4.5 %

Expected life (in years)

    6.25       6.25-10  

Weighted-average grant date fair value per share

  $ 1.78     $ 2.93