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Note 11 - Warrant Liability (Tables)
12 Months Ended
Dec. 31, 2025
Notes Tables  
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
  

As of December 31, 2025

  

As of December 31, 2024

 

Expected life of the options to convert

  3.97   4.97 

Risk-free rate

  3.58%  4.29%

Historical volatility

  123.69%  96.71%

Valuation date stock price

 $4.80  $25.20 

Strike price

 

$19.30/$19.20

  

$19.30/$19.20

 

Probability of completing a change in control

  5%  20%

Volatility if change in control occurs

  100%  100%

Dividend yield

  0%  0%
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
  

Warrant liability

 

Fair value as of December 31, 2024

 $1,493 

Change in fair value of warrant liabilities

  (1,266)

Fair value as of December 31, 2025

 $227