Note 1 - Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 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 six months ended June 30,
	2023		2022
	Stock Options
Expected dividend yield		0.0%		0.0%
Expected stock price volatility		90.8% - 91.6%		86.5% - 92.2%
Risk-free interest rate		3.38% - 3.72%		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