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Note 15 - Stock-based Compensation (Tables)
12 Months Ended
Dec. 31, 2024
Notes Tables  
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

Non-Employee Director Options Issued January 8, 2024

  

Employee Options Issued January 8, 2024

  

Employee Options Issued February 26, 2024

  

Employee Options Issued April 24, 2024

  

Employee Options Issued July 9, 2024

 

Risk-free interest rate

 4.01% 4.01% 4.28% 4.65% 4.30%

Volatility

 175.36% 175.36% 178.14% 211.61% 214.61%

Expected dividend yield

 0.00% 0.00% 0.00% 0.00% 0.00%

Expected life (in years)

 6.5  6.5  6.5  6.5  6.5 
  

Non-Plan Options Issued May 1, 2024

 

Risk-free interest rate

  4.63%

Volatility

  211.61%

Expected dividend yield

  0.00%

Expected life (in years)

  6.5 
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
      

Weighted

  

Weighted

     
      

Average

  

Average

  

Aggregate

 
      

Exercise

  

Remaining

  

Intrinsic

 
  

Stock Options

  

Price

  

Life

  

Value

 

Outstanding at December 31, 2023

  21,465  $64.71   6.38  $ 

Options exercised

            

Options granted

  66,000   4.08       

Cancelled/forfeited

  (16,860)  4.49       

Outstanding at December 31, 2024

  70,605  $20.88   8.38  $ 

Vested and expected to vest at December 31, 2024

  70,605  $20.88   8.38  $ 

Exercisable at December 31, 2024

  18,352  $68.64   5.96  $ 
      

Weighted

  

Weighted

     
      

Average

  

Average

  

Aggregate

 
      

Exercise

  

Remaining

  

Intrinsic

 
  

Stock Options

  

Price

  

Life

  

Value

 

Outstanding at December 31, 2023

    $     $ 

Options exercised

            

Options granted

  25,000   5.32       

Cancelled/forfeited

            

Outstanding at December 31, 2024

  25,000  $5.32   9.33  $ 

Vested and expected to vest at December 31, 2024

  25,000  $5.32   9.33  $ 

Exercisable at December 31, 2024

    $     $ 
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Unrecognized Expense (in thousands)

  

Remaining Weighted Average Recognition Period (in years)

 

Stock options (Non-Plan Options)

 $113   4.3 

Stock options (2023 Plan Options)

 $178   4.1 

Restricted stock awards

 $    

Restricted stock units

 $