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Note 9 - Information Concerning Product Lines, Geographic Information and Revenue Concentration (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Apr. 03, 2022
Apr. 04, 2021
Jan. 02, 2022
Revenue from Contract with Customer, Excluding Assessed Tax $ 4,096 $ 2,240  
Contract with Customer, Liability, Current 67   $ 455
JAPAN      
Revenue from Contract with Customer, Excluding Assessed Tax $ 1,400 $ 700  
JAPAN | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]      
Concentration Risk, Percentage 33.00% 32.00%  
UNITED STATES      
Revenue from Contract with Customer, Excluding Assessed Tax $ 2,400 $ 1,200  
UNITED STATES | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]      
Concentration Risk, Percentage 59.00% 56.00%  
Engineering Services [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax $ 1,600 $ 0  
SaaS Revenue [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax 34 $ 100  
Professional Services [Member]      
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total 100   300
Contract with Customer, Liability, Current $ 0   $ 300