v3.25.2
Note 8 - Share-based Compensation (Tables)
6 Months Ended
Jun. 30, 2025
Notes Tables  
Schedule of Share-based Compensation, Expense [Table Text Block]
   

Three months ended

   

Six months ended

 
   

June 30,

   

June 30,

 
   

2025

   

2024

   

2025

   

2024

 

Research and development

  $ 55     $ 102     $ 150     $ 217  

Selling, general and administrative

    43       82       118       171  

Total share-based compensation

  $ 98     $ 184     $ 268     $ 388  
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
   

Number of

shares

   

Weighted

average

exercise price

   

Weighted

average

remaining

contractual

term (years)

   

Aggregate

intrinsic value
(in thousands)

 
                                 

Balance, December 31, 2024

    168,184     $ 47.97       6.6     $  

Stock options forfeited

    (715 )     23.68                  

Balance, June 30, 2025

    167,469     $ 48.08       6.0     $  

Exercisable, June 30, 2025

    132,377     $ 56.93       5.4     $  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
           

Weighted

 
           

average

 
           

grant date

 
   

Number of

   

fair value

 
   

shares

   

per share

 

Balance, December 31, 2024

        $ n/a  

RSUs granted

    1,000       2.09  

RSUs released

    (1,000 )     2.09  

Balance, June 30, 2025

        $ n/a