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Note 6 - Prepaid Expenses (Tables)
3 Months Ended
Mar. 31, 2023
Notes Tables  
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
  

March 31,

  

December 31,

 
  

2023

  

2022

 

Prepaid research and development

 $4,619  $3,480 

Prepaid insurance

  520   387 

Professional services

  138   130 

Other

  18   34 

Total prepaid expenses

 $5,295  $4,031