v3.26.1
Note 7 - Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 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 exercised

    (31,000 )     1.25  

Warrants expired

    (67,104 )     6.63  

Outstanding and exercisable as of June 30, 2026

    7,846,514     $ 1.84  
Schedule of Activity Under Sales Agreement [Table Text Block]
   

Three months ended

   

Six months ended

 
   

June 30,

   

June 30,

 
   

2026

   

2025

   

2026

   

2025

 

Common shares sold

    4,004,330       140,104       4,189,055       221,378  

Gross proceeds

  $ 5,084     $ 350     $ 5,309     $ 562  

Associated issuance costs

  $ 198     $ 45     $ 238     $ 72