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Note 7 - Stock-based Compensation (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   Three Months   Nine Months 

Risk-free interest rate

  2.85% - 2.90%   1.91% - 2.90% 

Dividend yield

  0%  0%

Expected term (years)

  3.25 - 6.00   3.25 - 6.00 

Expected volatility

  45.9% - 48.1%   45.8% - 48.5%