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Note 5 - Prepaid Expenses (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
  

As of June 30,

  

As of December 31,

 
  

2022

  

2021

 

Prepaid research and development

 $4,488  $1,853 

Prepaid insurance

  579   461 

Professional services

  186   124 

Other

  51   50 

Total prepaid expenses

 $5,304  $2,488