Note 10 - Information Concerning Product Lines, Geographic Information and Revenue Concentration - Schedule of Revenue by Product Line (Details) - USD ($) $ in Thousands		3 Months Ended
		Apr. 04, 2021	Mar. 29, 2020
Total revenue	[1]	$ 2,240	$ 2,158
New Products [Member]
Total revenue	[1]	1,075	486
Mature Products [Member]
Total revenue	[1]	$ 1,165	$ 1,672

[1] New products include all products manufactured on 180 nanometer or smaller semiconductor processes, eFPGA IP license, QuickAI and SensiML AI software as a service (SaaS) revenues. Mature products include all products produced on semiconductor processes larger than 180 nanometer.