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

December 31,

 
  

2023

  

2022

 

Prepaid insurance

 $759  $874 

Contract research organization and other deposits

  6,489   9,177 

Interest receivable

  962    

Other

  287   160 

Total prepaid expenses and other current assets

 $8,497  $10,211