Note 6 - Goodwill, In-process Research and Development and Intellectual Property (Details Textual) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Impairment of Intangible Assets, Finite-lived	$ 0		$ 7,912	$ 0	$ 7,912
In Process Research and Development [Member]
Impairment of Intangible Assets, Finite-lived		$ 0	$ 7,900
Developed Technology Rights [Member] | Weighted Average [Member]
Finite-Lived Intangible Assets, Remaining Amortization Period (Year)				2 years 4 months 24 days
Technology-Based Intangible Assets [Member] | Weighted Average [Member]
Finite-Lived Intangible Assets, Remaining Amortization Period (Year)				6 years 7 months 6 days