Note 7 - Stock-based Compensation (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2023

Dec. 31, 2022

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%

	2022				2021
Risk-free interest rate		1.88%	-	4.26%		0.46%	-	.26%
Dividend yield			0%				0%
Expected term (in years)		3.25	–	6		2.5	–	5
Expected volatility		45.8%	-	48.1%		46.0%	-	92.0%