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Note 1 - Summary of Significant Accounting Policies - Schedule of Property, Plant and Equipment, Useful Life (Details)
6 Months Ended
Jun. 30, 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
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
Minimum [Member] | Laboratory Equipment [Member]  
Property, plant, and equipment, useful life (Year) 4 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
Maximum [Member] | Laboratory Equipment [Member]  
Property, plant, and equipment, useful life (Year) 6 years
[1] Leasehold improvements are depreciated over the shorter of the useful life or the remaining lease term.