Note 6 - Intangible Assets - Weighted-average Amortization Periods Remaining (Details)	12 Months Ended
	Dec. 31, 2019
Developed Technology Rights [Member]
Finite-lived intangible assets, remaining amortization period (Year)	3 years
Customer Relationships [Member]
Finite-lived intangible assets, remaining amortization period (Year)	4 years
Trade Names [Member]
Finite-lived intangible assets, remaining amortization period (Year)	2 years
Patents [Member]
Finite-lived intangible assets, remaining amortization period (Year)	7 years 7 months 6 days
Computer Software, Intangible Asset [Member]
Finite-lived intangible assets, remaining amortization period (Year)	2 years 8 months 12 days