Note 12 - 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
		Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Total revenue	[1]	$ 1,780	$ 2,158	$ 6,134	$ 7,439
Asia Pacific [Member]
Total revenue	[2]	320	528	1,505	2,496
North America [Member]
Total revenue	[3]	1,087	1,518	3,321	3,747
Europe [Member]
Total revenue		$ 373	$ 112	$ 1,308	$ 1,196

[1] For all periods presented: New products include all products manufactured on 180 nanometer or smaller semiconductor processes, eFPGA IP license, Quick AI 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 $271,000, or 15% of total revenue and $510,000 or 24% of total revenue for the quarters ended September 27, 2020 and September 29, 2019, respectively. For the nine months ended September 27, 2020 and September 29, 2019, revenue from Japan was $1.4 million, or 23% of total revenue, and $1.3 million, or 17% of total revenue, respectively.

[3] North America includes revenue from the United States of $1.1 million, or 61% of total revenue, and $1.4 million, or 67% of total revenue, for the three months ended September 27, 2020 and September 29, 2019, respectively. For the nine months ended September 27, 2020 and September 29, 2019 revenue from the United States was $3.3 million, or 54% of total revenue, and $3.6 million, or 49% of total revenue, respectively.