Note 14 - Information Concerning Product Lines, Geographic Information, Accounts Receivable and Revenue Concentration - Schedule of Revenue by Shipment Destination (Details) - USD ($) $ in Thousands		12 Months Ended
		Jan. 03, 2021	Dec. 29, 2019	Dec. 30, 2018
Total revenue	[1]	$ 8,634	$ 10,310	$ 12,629
Asia Pacific [Member]
Total revenue	[2]	2,096	3,049	4,905
Europe [Member]
Total revenue		1,501	2,459	1,280
North America [Member]
Total revenue	[3]	$ 5,037	$ 4,802	$ 6,444

[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.

[2] Asia Pacific includes revenue from Japan of $2.0 million or 23% of total revenue in 2020 In 2019 revenue from Chinas was $1.1 million or 11% and Japan $1.8 million or 17%, respectively. In 2018, revenue from China was $1.8 million or 15% and Japan $1.6 million or 12%, respectively.

[3] North America includes revenue from the United States of $5.0 million or 58% of total revenue in 2020, $4.7 million or 46% of total revenue in 2019 and $6.4 million or 50% of total revenue in 2018.