Note 6 - Goodwill, In-Process Research and Development and Intellectual Property (Details Textual) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Impairment of Intangible Assets, Finite-lived					$ 0	$ 0
In Process Research and Development [Member]
Impairment of Intangible Assets, Finite-lived	$ 0	$ 0	$ 7,900	$ 0	$ 0	$ 0
Developed Technology Rights [Member] | Weighted Average [Member]
Finite-Lived Intangible Assets, Remaining Amortization Period (Year)					2 years 8 months 12 days
Technology-Based Intangible Assets [Member] | Weighted Average [Member]
Finite-Lived Intangible Assets, Remaining Amortization Period (Year)					6 years 9 months 18 days