Note 7 - Intellectual Property - Intellectual Property (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets, Gross	$ 69,238	$ 69,238
Finite-Lived Intangible Assets, Accumulated Amortization	(66,991)	(66,801)
Finite-Lived Intangible Assets, Foreign Currency Translation Impact	(836)	(861)
Intellectual property, net	1,411	1,576
Developed Technology Rights [Member]
Finite-Lived Intangible Assets, Gross	68,838	68,838
Finite-Lived Intangible Assets, Accumulated Amortization	(66,732)	(66,562)
Finite-Lived Intangible Assets, Foreign Currency Translation Impact	(852)	(874)
Intellectual property, net	1,254	1,402
Technology-Based Intangible Assets [Member]
Finite-Lived Intangible Assets, Gross	400	400
Finite-Lived Intangible Assets, Accumulated Amortization	(259)	(239)
Finite-Lived Intangible Assets, Foreign Currency Translation Impact	16	13
Intellectual property, net	$ 157	$ 174