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Note 5 - Stock Based Compensation (Tables)
9 Months Ended
Sep. 30, 2025
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended September 30,

  

Nine Months Ended September 30,

 
  

2025

  

2024

  

2025

  

2024

 

General and administrative

 $203  $259  $866  $980 

Research and development

  100   94   339   319 

Total stock-based compensation expense

 $303  $353  $1,205  $1,299