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Note 8 - Preferred Stock and Common Stock Warrants (Tables)
3 Months Ended
Mar. 31, 2023
Notes Tables  
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
  

March 31,

  

December 31,

 
  

2023

  

2022

 

Stock price

 $4.97  $4.94 

Exercise price

 $0.01  $0.01 

Risk-free rate

  4.1%  4.6%

Volatility

  48.3%  52.5%

Term (years)

  1.2   1.5