Note 14 - Information Concerning Product Lines, Geographic Information, and Revenue Concentration (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2023	Jan. 01, 2023	Jan. 02, 2022
Revenue from Contract with Customer, Excluding Assessed Tax	$ 21,198,000	$ 16,180,000	$ 12,685,000
Contract with Customer, Liability, Current	1,052,000	272,000
UNITED STATES
Revenue from Contract with Customer, Excluding Assessed Tax	$ 18,600,000	$ 10,600,000	$ 6,900,000
Percentage of Revenue	88.00%	67.00%	54.00%
UNITED KINGDOM | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage		10.00%
Non-US [Member] | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	0.40%	1.20%
Professional Services [Member]
Contract with Customer, Asset, after Allowance for Credit Loss	$ 16,600,000	$ 7,400,000	$ 1,500,000
Revenue from Contract with Customer, Excluding Assessed Tax	14.8	3.3
Contract with Customer, Liability, Current	1,100,000	300,000	500,000
Engineering Services [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	3,600,000	2,000,000	300,000
Contract with Customer, Liability, Current	$ 1,100,000	$ 300,000	$ 500,000