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Note 7 - Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2026
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   

Number of

   

Weighted

 
   

Common Stock

   

Average

 
   

Equivalents

   

Exercise Price

 

Outstanding and exercisable as of December 31, 2025

    7,944,618     $ 1.88  

Warrants expired

    (67,104 )     6.63  

Outstanding and exercisable as of March 31, 2026

    7,877,514     $ 1.84  
Schedule of Activity Under Sales Agreement [Table Text Block]
   

Three months ended

 
   

March 31,

 
   

2026

   

2025

 

Common shares sold

    184,725       81,274  

Gross proceeds

  $ 225     $ 212  

Associated issuance costs

  $ 40     $ 27