v3.26.1
Note 7 - Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2026
Notes Tables  
Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block]
  

Number of

  

Weighted

 
  

Units and

  

Average Grant

 
  

Awards

  

Date Fair Value

 

Unvested balance at December 31, 2025

  235,400  $3.19 

Vested

  (200)  85.50 

Unvested balance at June 30, 2026

  235,200  $2.53 
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
          

Weighted

     
          

Average

     
      

Weighted

  

Remaining

  

Aggregate

 
  

Number

  

Average

  

Contractual

  

Intrinsic Value

 
  

of Options

  

Exercise Price

  

Term (years)

  

(in thousands)

 

Outstanding at December 31, 2025

  256,474  $9.74   8.6  $ 

Outstanding at June 30, 2026

  256,474  $9.74   8.1  $ 

Expected to vest

  81,950  $6.46   8.2  $ 

Exercisable

  174,524  $11.27   8.1  $ 
Share-Based Payment Arrangement, Cost by Plan [Table Text Block]
  

For the Three Months Ended

  

For the Six Months Ended

 
  

June 30,

  

June 30,

 
  

2026

  

2025

  

2026

  

2025

 

Research and development

 $15  $31  $29  $71 

General and administrative

  46   144   93   289 

Total stock-based compensation expense

 $61  $175  $122  $360 
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
              

Weighted

 
      

Weighted

      

Average

 
      

Average

  

Aggregate

  

Remaining

 
      

Exercise

  

Intrinsic Value

  

Contractual Life

 
  

Warrants

  

Price

  

(in thousands)

  

(in years)

 

Outstanding, December 31, 2025

  772,741  $10.56  $   3.3 

Expired

  (10)  0.11       

Outstanding, June 30, 2026

  772,731  $10.56  $   2.8