Note 5 - Intellectual Property - Intellectual Property (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets, Gross	$ 69,238	$ 69,238
Finite-Lived Intangible Assets, Accumulated Amortization	(55,940)	(51,902)
Finite-Lived Intangible Assets, Foreign Currency Translation Impact	2,645	4,931
Intellectual property, net	15,943	22,267
Developed Technology Rights [Member]
Finite-Lived Intangible Assets, Gross	68,838	68,838
Finite-Lived Intangible Assets, Accumulated Amortization	(55,755)	(51,734)
Finite-Lived Intangible Assets, Foreign Currency Translation Impact	2,601	4,872
Intellectual property, net	15,684	21,976
Technology-Based Intangible Assets [Member]
Finite-Lived Intangible Assets, Gross	400	400
Finite-Lived Intangible Assets, Accumulated Amortization	(185)	(168)
Finite-Lived Intangible Assets, Foreign Currency Translation Impact	44	59
Intellectual property, net	$ 259	$ 291