Note 8 - Goodwill and Identifiable Intangible Assets - Weighted-average Amortization Periods (Details)	12 Months Ended
	Dec. 31, 2018
Developed Technology Rights [Member]
Finite-lived intangible assets, remaining amortization period (Year)	3 years 182 days
Customer Relationships [Member]
Finite-lived intangible assets, remaining amortization period (Year)	5 years
Trade Names [Member]
Finite-lived intangible assets, remaining amortization period (Year)	2 years 219 days
Patents [Member]
Finite-lived intangible assets, remaining amortization period (Year)	8 years 36 days
Computer Software, Intangible Asset [Member]
Finite-lived intangible assets, remaining amortization period (Year)	1 year 255 days