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Note 3 - Prepaid Expenses and Other Current Assets (Tables)
9 Months Ended
Sep. 30, 2025
Notes Tables  
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
   

September 30,

   

December 31,

 
   

2025

   

2024

 

Prepaid insurance

  $ 698     $ 800  

Contract research organization and other deposits

    1,208       6,173  

Interest receivable

    817       947  

Other

    106       38  

Total prepaid expenses and other current assets

  $ 2,830     $ 7,958