Note 7 - Intellectual Property - Intellectual Property (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets, Gross	$ 69,238	$ 69,238
Finite-Lived Intangible Assets, Accumulated Amortization	(60,291)	(59,111)
Finite-Lived Intangible Assets, Foreign Currency Translation Impact	(1,938)	(235)
Intellectual property, net	7,009	9,892
Developed Technology Rights [Member]
Finite-Lived Intangible Assets, Gross	68,838	68,838
Finite-Lived Intangible Assets, Accumulated Amortization	(60,086)	(58,912)
Finite-Lived Intangible Assets, Foreign Currency Translation Impact	(1,954)	(262)
Intellectual property, net	6,798	9,664
Technology-Based Intangible Assets [Member]
Finite-Lived Intangible Assets, Gross	400	400
Finite-Lived Intangible Assets, Accumulated Amortization	(205)	(199)
Finite-Lived Intangible Assets, Foreign Currency Translation Impact	16	27
Intellectual property, net	$ 211	$ 228