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Note 5 - Accrued and Other Current Liabilities (Tables)
9 Months Ended
Sep. 30, 2024
Notes Tables  
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]
  

September 30, 2024

  

December 31, 2023

 
  

(Unaudited)

     

Accrued and other current liabilities:

        

Refund liability (see Note 6)

 $4,715  $ 

Professional services

  3,573   2,686 

Employee costs

  324   835 

Accrued research and development expense

  592   1,112 

Other accrued expense

  240   81 

Total accrued and other current liabilities

 $9,444  $4,714