Note I - Intangible Assets, Net - Finite-lived Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Intangible assets, gross amount	$ 9,640	$ 9,050
Intangible assets, accumulated amortization	(6,012)	(5,351)
Intangible assets, net	3,628	3,699
Patents [Member]
Intangible assets, gross amount	9,502	8,994
Intangible assets, accumulated amortization	(5,981)	(5,330)
Intangible assets, net	3,521	3,664
Trademarks [Member]
Intangible assets, gross amount	138	56
Intangible assets, accumulated amortization	(31)	(21)
Intangible assets, net	$ 107	$ 35