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Note 7 - Warrants (Tables)
9 Months Ended
Sep. 30, 2022
Notes Tables  
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
  

As of September 30,

  

2022

Exercise price of warrants granted

 

$ 0.01

Expected volatility

 

52.5%

Expected terms in years

 

0.0

Risk-free interest rate

 

3.9%

Expected dividend yield

 

0.0%