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Note 4 - Prepaid Expenses (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

 
  

(unaudited)

     

Prepaid director and officer liability insurance

 $44  $27 

Refundable Delaware franchise taxes

     133 

Other

  223   89 

Total prepaid expenses and other current assets

 $267  $249