Note I - Intangible Assets - Finite-lived Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Intangible assets, gross amount	$ 9,050	$ 8,632
Intangible assets, accumulated amortization	(5,351)	(4,796)
Intangible assets, net	3,699	3,836
Patents [Member]
Intangible assets, gross amount	8,994	8,597
Intangible assets, accumulated amortization	(5,330)	(4,779)
Intangible assets, net	3,664	3,818
Trademarks [Member]
Intangible assets, gross amount	56	35
Intangible assets, accumulated amortization	(21)	(17)
Intangible assets, net	$ 35	$ 18