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Note 7 - Stock-based Compensation (Tables)
3 Months Ended
Mar. 31, 2023
Notes Tables  
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

2022

 

Risk-free interest rate

 1.91%-2.41% 

Dividend yield

  0%  

Expected term (years)

 5.75-6.00 

Expected volatility

 45.8%-46.1%