Note I - Intangible Assets, Net - Finite-lived Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Intangible assets, gross amount	$ 10,091	$ 9,640
Intangible assets, accumulated amortization	(6,411)	(6,012)
Intangible assets, net	3,680	3,628
Patents [Member]
Intangible assets, gross amount	9,873	9,502
Intangible assets, accumulated amortization	(6,355)	(5,981)
Intangible assets, net	3,518	3,521
Trademarks [Member]
Intangible assets, gross amount	218	138
Intangible assets, accumulated amortization	(56)	(31)
Intangible assets, net	$ 162	$ 107