Note 1 - Summary of Significant Accounting Policies - Schedule of Property, Plant and Equipment, Useful Life (Details)	3 Months Ended
	Mar. 31, 2020
Leasehold Improvements [Member]
Property, plant, and equipment, useful life (Year)	5 years	[1]
Demo Equipment [Member]
Property, plant, and equipment, useful life (Year)	3 years
Laboratory Equipment [Member]
Property, plant, and equipment, useful life (Year)	4 years
Minimum [Member] | Office Equipment [Member]
Property, plant, and equipment, useful life (Year)	3 years
Minimum [Member] | Manufacturing Tooling [Member]
Property, plant, and equipment, useful life (Year)	3 years
Maximum [Member] | Office Equipment [Member]
Property, plant, and equipment, useful life (Year)	7 years
Maximum [Member] | Manufacturing Tooling [Member]
Property, plant, and equipment, useful life (Year)	7 years

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