Note 1 - Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 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 three months ended March 31,
	2023		2022
	Stock Options
Expected dividend yield		0.0%		0.0%
Expected stock price volatility		90.8%		86.5%
Risk-free interest rate		3.38% - 3.55%		1.83% - 1.92%
Expected life (years)	10		10