Note 10 - Information Concerning Product Lines, Geographic Information and Revenue Concentration - Schedule of Revenue by Shipment Destination (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2022	Oct. 03, 2021	Oct. 02, 2022	Oct. 03, 2021
Total revenue	$ 3,459	$ 3,858	$ 12,096	$ 8,980
Asia Pacific [Member]
Total revenue	783	763	3,114	2,440
North America [Member]
Total revenue	2,389	2,605	7,904	4,429
Europe [Member]
Total revenue	$ 287	$ 490	$ 1,078	$ 2,111