Note K - Domestic and Foreign Revenues - Schedule of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Net sales	$ 438	$ 344	$ 1,282	$ 1,131
CANADA
Net sales	15	5	105	54
SPAIN
Net sales	94	34	330	65
INDIA
Net sales	37	0	60	31
FRANCE
Net sales	0	17	9	142
ROMANIA
Net sales	0	0	0	90
All Other Foreign Countries [Member]
Net sales	21	23	74	59
Non-US [Member]
Net sales	167	79	578	441
UNITED STATES
Net sales	$ 271	$ 265	$ 704	$ 690