Quarterly report pursuant to Section 13 or 15(d)

Note 12 - Share-based Compensation (Tables)

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Note 12 - Share-based Compensation (Tables)
6 Months Ended
Jun. 30, 2024
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
   

Three Months Ended

June 30

   

Six Months Ended

June 30

 
   

2024

   

2023

   

2024

   

2023

 

Research and development

  $ 107     $ 140     $ 302     $ 272  

General and administrative

    336       240       629       530  

Total share-based compensation

  $ 443     $ 380     $ 931     $ 802  
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
   

Shares

Underlying

Options

   

Weighted

Average

Exercise

Price Per Share

   

Aggregate

Intrinsic Value

 

Balances at December 31, 2023

    3,871,013     $ 3.61     $ 832  

Granted

    1,633,425       2.85          

Expired/cancelled

    (298,750 )     5.28          

Forfeited

    (343,667 )     2.68          

Exercised

    (2,750 )     2.45          

Balances at June 30, 2024

    4,859,271     $ 3.31     $ 1,037  
Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block]
         

Outstanding, Vested and Expected to Vest

   

Options Vested and Exercisable

 

Per Share

Exercise

Price

   

Shares

   

Weighted Average

Remaining

Contractual Life

(Years)

   

Weighted Average

Exercise Price

   

Options

Exercisable

   

Weighted Average

Remaining

Contractual Life

(Years)

 
$1.00 - $1.99       255,943       8.6     $ 1.58       113,393       8.4  
$2.00 - $2.99       3,067,645       8.3       2.73       764,844       6.7  
$3.00 - $3.99       452,726       6.6       3.59       311,702       5.4  
$4.00 - $4.99       688,432       5.0       4.57       688,432       5.0  
$5.00 - $16.00       394,525       5.9       6.41       321,088       5.6  
            4,859,271       7.5     $ 3.31       2,199,459       5.9