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Note 8 - Common Stock Warrants (Tables)
9 Months Ended
Sep. 30, 2025
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, 2024

 $16 

Change in fair value of warrants

  (15)

Fair value of warrants outstanding as of March 31, 2025

 $1 

Change in fair value of warrants

  (1)

Fair value of warrants outstanding as of June 30, 2025

 $- 

Change in fair value of warrants

  

2

 

Fair value of warrants outstanding as of September 30, 2025

 $2 
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
  

September 30,

  

December 31,

 
  

2025

  

2024

 

Stock price

 $0.79  $2.00 

Risk-free interest rate

  3.60%  4.27%

Expected dividend yield

      

Expected term in years

  2.0   2.8 

Expected volatility

  160%  155%