Note 1 - Significant Accounting Policies - Estimated Useful Lives of Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2019
Machinery and Equipment [Member] | Minimum [Member]
Property, plant and equipment, useful life (Year)	5 years
Machinery and Equipment [Member] | Maximum [Member]
Property, plant and equipment, useful life (Year)	7 years
Furniture and Fixtures [Member] | Minimum [Member]
Property, plant and equipment, useful life (Year)	5 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, plant and equipment, useful life (Year)	7 years
Leasehold Improvements [Member] | Minimum [Member]
Property, plant and equipment, useful life (Year)	3 years
Leasehold Improvements [Member] | Maximum [Member]
Property, plant and equipment, useful life (Year)	5 years
Computer Equipment [Member] | Minimum [Member]
Property, plant and equipment, useful life (Year)	3 years
Computer Equipment [Member] | Maximum [Member]
Property, plant and equipment, useful life (Year)	5 years