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

June 30,

  

December 31,

 
  

2025

  

2024

 

Prepaid insurance

 $5  $800 

Contract research organization and other deposits

  1,466   6,173 

Interest receivable

  835   947 

Other

  134   38 

Total prepaid expenses and other current assets

 $2,440  $7,958