Quarterly report [Sections 13 or 15(d)]

Note 8 - Common Stock Warrants (Tables)

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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 %