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Note 3 - Prepaid Expenses and Other Current Assets (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
   

September 30,

   

December 31,

 
   

2023

   

2022

 

Prepaid insurance

  $ 1,136     $ 874  

Contract research organization and other deposits

    5,224       9,177  

Interest receivable

    1,285        

Other

    189       160  

Total prepaid expenses and other current assets

  $ 7,834     $ 10,211