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Note 6 - Prepaid Expenses (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
  

As of September 30,

  

As of December 31,

 
  

2023

  

2022

 

Prepaid research and development

 $2,832  $3,480 

Prepaid insurance

  158   387 

Professional services

  362   130 

Other

  120   34 

Total prepaid expenses

 $3,472  $4,031