Note 10 - Information Concerning Product Lines, Geographic Information, and Revenue Concentration (Details Textual) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Apr. 02, 2023	Apr. 03, 2022	Jan. 01, 2023
Revenue from Contract with Customer, Excluding Assessed Tax	$ 4,133	$ 4,096
Contract with Customer, Liability, Current	299		$ 272
UNITED STATES
Revenue from Contract with Customer, Excluding Assessed Tax	$ 3,300	$ 2,400
Percentage of Revenue	80.00%	59.00%
UNITED KINGDOM | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage			10.00%
eFPGA Revenue [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 2,800	$ 1,600
New Products Related to Engineering Services [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	2,600
SaaS Revenue [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	200
Engineering Services [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	2,300	100
Professional Services [Member]
Contract with Customer, Liability, Current	$ 300	$ 0