Note 7 - Intellectual Property - Intellectual Property (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets, Gross	$ 69,238	$ 69,238
Finite-Lived Intangible Assets, Accumulated Amortization	(67,277)	(67,181)
Finite-Lived Intangible Assets, Foreign Currency Translation Impact	(847)	(820)
Intellectual property, net	1,114	1,237
Developed Technology Rights [Member]
Finite-Lived Intangible Assets, Gross	68,838	68,838
Finite-Lived Intangible Assets, Accumulated Amortization	(66,988)	(66,902)
Finite-Lived Intangible Assets, Foreign Currency Translation Impact	(861)	(837)
Intellectual property, net	989	1,099
Technology-Based Intangible Assets [Member]
Finite-Lived Intangible Assets, Gross	400	400
Finite-Lived Intangible Assets, Accumulated Amortization	(289)	(279)
Finite-Lived Intangible Assets, Foreign Currency Translation Impact	14	17
Intellectual property, net	$ 125	$ 138