Note 10 - Information Concerning Product Lines, Geographic Information and Revenue Concentration (Details Textual) - USD ($)		3 Months Ended
		Apr. 04, 2021	Mar. 29, 2020
Revenue from Contract with Customer, Excluding Assessed Tax, Total	[1]	$ 2,240,000	$ 2,158,000
JAPAN
Revenue from Contract with Customer, Excluding Assessed Tax, Total		$ 724,000	$ 394,000
JAPAN | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage		32.00%	18.00%
UNITED STATES
Revenue from Contract with Customer, Excluding Assessed Tax, Total		$ 1,200,000	$ 942,000
UNITED STATES | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage		56.00%	44.00%
Non-US [Member] | Geographic Concentration Risk [Member] | Assets, Total [Member]
Concentration Risk, Percentage		3.60%

[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.