Note 1 - Summary of Significant Accounting Policies - Schedule of Property, Plant and Equipment, Useful Life (Details)	12 Months Ended
	Dec. 31, 2021
Demo Equipment [Member]
Computers, software and office equipment (Year)	3 years
Minimum [Member] | Office Equipment [Member]
Computers, software and office equipment (Year)	3 years
Minimum [Member] | Leasehold Improvements [Member]
Computers, software and office equipment (Year)	2 years	[1]
Minimum [Member] | Manufacturing Tooling [Member]
Computers, software and office equipment (Year)	3 years
Minimum [Member] | Laboratory Equipment [Member]
Computers, software and office equipment (Year)	4 years
Maximum [Member] | Office Equipment [Member]
Computers, software and office equipment (Year)	10 years
Maximum [Member] | Leasehold Improvements [Member]
Computers, software and office equipment (Year)	5 years	[1]
Maximum [Member] | Manufacturing Tooling [Member]
Computers, software and office equipment (Year)	7 years
Maximum [Member] | Laboratory Equipment [Member]
Computers, software and office equipment (Year)	10 years

[1] Leasehold improvements are amortized over the shorter of the useful life or the remaining lease term.