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Note 8 - Warrants (Tables)
12 Months Ended
Dec. 31, 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%