v3.26.1
Note 8 - Common Stock Warrants (Tables)
6 Months Ended
Jun. 30, 2026
Notes Tables  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
  

October 2022

 
  

Warrants

 

Fair value of warrants outstanding as of December 31, 2025

 $1 

Change in fair value of warrants

  (1)

Fair value of warrants outstanding as of June 30, 2026

 $ 
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
  

June 30,

  

December 31,

 
  

2026

  

2025

 

Stock price

 $0.28  $0.68 

Risk-free interest rate

  3.70%  3.75%

Expected dividend yield

      

Expected term in years

  1.3   1.8 

Expected volatility

  206%  151%