Quarterly report [Sections 13 or 15(d)]

Note 8 - Common Stock Warrants (Tables)

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Note 8 - Common Stock Warrants (Tables)
9 Months Ended
Sep. 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 September 30, 2026

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

September 30,

   

December 31,

 
   

2026

   

2025

 

Stock price

  $ 0.27     $ 0.68  

Risk-free interest rate

    4.02 %     3.75 %

Expected dividend yield

    —       —  

Expected term in years

    1.0       1.8  

Expected volatility

    242 %     151 %