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Note 5 - Equity (Tables)
6 Months Ended
Jun. 30, 2024
Notes Tables  
Share-based Payment Arrangement, Expensed, Amount [Table Text Block]
  

Three Months Ended June 30,

  

Six Months Ended June 30,

 
  

2024

  

2023

  

2024

  

2023

 

General and administrative

 $340  $379  $721  $748 

Research and development

  113   134   225   264 

Total stock-based compensation expense

 $453  $513  $946  $1,012