Note 10 - Information Concerning Product Lines, Geographic Information and Revenue Concentration - Schedule of Revenue by Product Line (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2021	Sep. 27, 2020	Oct. 03, 2021	Sep. 27, 2020
Revenue	$ 3,858	$ 1,780	$ 8,980	$ 6,134
Total revenue	3,858	1,780	8,980	6,134
New Products [Member]
Revenue	2,758	639	5,095	1,945
Total revenue	2,758	639	5,095	1,945
Device Sales [Member]
Revenue	2,858	1,766	7,830	6,002
Total revenue	2,858	1,766	7,830	6,002
Mature Products [Member]
Revenue	1,100	1,141	3,885	4,189
Total revenue	1,100	1,141	3,885	4,189
IP License and Other Services [Member]
Revenue	1,000	14	1,150	132
Total revenue	$ 1,000	$ 14	$ 1,150	$ 132