Note 9 - Intangible Assets, Net - Finite-lived Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Intangible assets, gross amount	$ 10,341	$ 10,091
Intangible assets, accumulated amortization	(6,702)	(6,411)
Intangible assets, net	3,639	3,680
Patents [Member]
Intangible assets, gross amount	10,113	9,873
Intangible assets, accumulated amortization	(6,632)	(6,355)
Intangible assets, net	3,481	3,518
Trademarks [Member]
Intangible assets, gross amount	228	218
Intangible assets, accumulated amortization	(70)	(56)
Intangible assets, net	$ 158	$ 162