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Note 10 - Preferred Stock and Common Stock Warrants (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
  

September 30,

 

December 31,

  

2023

 

2022

Stock price

 $5.12  $4.94 

Exercise price

 $0.01  $0.01 

Risk-free rate

  5.3%  4.6%

Volatility

  81.9%  52.5%

Term (years)

  0.7   1.5