v3.26.1
Note 15 - Equity Incentive Plans (Tables)
12 Months Ended
Dec. 31, 2025
Notes Tables  
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
          

Options Outstanding

 
  

Shares Available For Grant

  

Number of Options

  

Weighted-Average Exercise Price

  

Weighted-Average Grant Date Fair Value

  

Weighted-Average Remaining Contractual Life (in years)

  

Aggregate Intrinsic Value (in thousands)

 

Balance as of January 1, 2024

  424   863  $2,454.97  $12.58   7.42  $ 

Shares reserved for issuance

  4,312                    

Added per amendment annual shareholder meeting

  53,390                    

Reserved shares cancelled

                      

Options granted

  (8,118)  8,118  $9.86  $8.33         

Options forfeited / cancelled

  107   (136) $2208.30  $11.39         

Options rounded for reverse stock split

     23                 

RSAs granted

  (442)                    

RSUs granted

  (44,118)                    

Options expired

       $  $         

Options exercised

       $  $         

Balance as of December 31, 2024

  5,555   8,868  $219.12  $8.67   9.22  $10 

Shares reserved for issuance

  27,846                    

Added per amendment annual shareholder meeting

  425,000                    

Options granted

  (346,500)  400,500  $3.12  $2.82         

Options forfeited / cancelled

  15,374   (16,874) $3.22  $2.79         

RSUs granted inside pool

  (32,788)         $3.05         

RSUs forfeited

  6,618                     

Balance as of December 31, 2025

  101,105   392,494  $8.00  $2.96   9.60  $ 
                         

As of December 31, 2025

                        

Vested and exercisable

      16,948  $114.62  $5.86   8.46  $ 
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

2025

  

2024

 
  

Minimum

  

Maximum

  

Minimum

  

Maximum

 

Expected life (in years)

  5.31   6.11   5.23   5.66 

Expected volatility

  125.86%  140.57%  114.62%  119.28%

Risk-free interest rate

  3.77%  4.05%  3.83%  4.40%

Dividend yield

  0%  0%  0%  0%
Nonvested Restricted Stock Shares Activity [Table Text Block]
  

Number of Shares

  

Weighted-Average Grant-Date Fair Value Per Share

 

Non-vested as of January 1, 2024

    $ 

Issuance of restricted common stock

  442  $22.78 

Vested

  (331) $22.78 

As of December 31, 2024

  111  $22.78 

Issuance of restricted common stock

    $ 

Vested

  (111) $22.78 

Cancelled

    $ 

As of December 31, 2025

    $ 
  

Number of Shares

  

Weighted-Average Grant-Date Fair Value Per Share

 

Balance as of January 1, 2024

    $ 

Granted

  44,119  $3.91 

Vested

    $ 

Forfeited

    $ 

Canceled

    $ 

Balance as of December 31, 2024

  44,119  $3.91 

Granted

  68,083  $5.96 

Vested

  (54,848) $2.34 

Forfeited

  (6,618) $3.84 

Canceled

    $ 

Balance as of December 31, 2025

  50,736  $5.96 
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  For the Year Ended December 31, 
  

2025

  

2024

 

Research and development

 $218  $93 

Selling, general and administrative

  346   136 

Total stock-based compensation

 $564  $229