Note 1 - Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2023

Notes Tables

Property Plant and Equipment Useful Life [Table Text Block]

	Years
Computers, software, and office equipment	3	-	10
Leasehold improvements (1)		2
Manufacturing tooling	3	-	7
Laboratory equipment	4	-	10
Demo equipment		3

Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

	For the nine months ended September 30,
	2023	2022
	Stock Options
Expected dividend yield	0.0%	0.0%
Expected stock price volatility	90.8% – 98.2%	86.5% – 92.2%
Risk-free interest rate	3.38% – 3.95%	1.83% – 3.43%
Expected life (years)	10	10
	Warrants
Expected dividend yield	0.0%	0.0%
Expected stock price volatility	0%	92.2%
Risk-free interest rate	0%	2.96% – 2.97%
Expected life (years)	0	5 – 5.5