Note 2 - Summary of Significant Accounting Policies - Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2020
Building [Member] | Maximum [Member]
Property and equipment (Year)	25 years
Machinery and Equipment [Member] | Maximum [Member]
Property and equipment (Year)	15 years
Machinery and Equipment [Member] | Minimum [Member]
Property and equipment (Year)	5 years
Furniture and Fixtures [Member] | Maximum [Member]
Property and equipment (Year)	7 years
Furniture and Fixtures [Member] | Minimum [Member]
Property and equipment (Year)	2 years
Leasehold Improvements [Member] | Maximum [Member]
Property and equipment (Year)	5 years
Leasehold Improvements [Member] | Minimum [Member]
Property and equipment (Year)	4 years
Software Development [Member] | Maximum [Member]
Property and equipment (Year)	5 years