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Note 8 - Share-based Compensation
 3 Months Ended
Mar. 31, 2025
Notes to Financial Statements  
Share-Based Payment Arrangement [Text Block]

(8)

Share-Based Compensation

 

The share-based compensation expense is recorded in research and development, and selling, general and administrative expenses based on the employee's or non-employee’s respective function. No share-based compensation was capitalized during the periods presented. Share-based compensation expense for the three months ended March 31, 2025 and 2024 was recorded as follows (in thousands):

 

   

Three months ended

 
   

March 31,

  
   

2025

    

2024

  

Research and development

   $ 95     $ 115  

Selling, general and administrative

     75       89  

Total share-based compensation

   $ 170     $ 204  

 

The following table summarizes the activity of stock options and related information:

 

   

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     $ —  

Balance, March 31, 2025

     168,184     $ 47.97       6.3     $ —  

Exercisable, March 31, 2025

     127,826     $ 58.07       5.7     $ —  

 

Unrecognized share-based compensation for employee and nonemployee options granted through March 31, 2025 is $527,000 to be recognized over a remaining weighted average service period of 1.8 years.