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Note 7 - Stockholders' Equity (Tables)
9 Months Ended
Sep. 30, 2025
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   

Number of

   

Weighted

 
   

Common Stock

   

Average

 
   

Equivalents

   

Exercise Price

 

Balance as of December 31, 2024

    2,467,104     $ 3.10  

Warrants for common stock sold

    5,481,514       1.33  

Balance as of September 30, 2025

    7,948,618     $ 1.88  
Schedule of Activity Under Sales Agreement [Table Text Block]
   

Three months ended

   

Nine months ended

 
   

September 30,

   

September 30,

 
   

2025

   

2024

   

2025

   

2024

 

Common shares sold

    303,932             525,310       412,239  

Gross proceeds

  $ 783     $     $ 1,345     $ 2,438  

Associated issuance costs

  $ 40     $     $ 112     $ 103