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Note 10 - Information Concerning Product Lines, Geographic Information, and Revenue Concentration (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 02, 2023
Jul. 03, 2022
Apr. 03, 2022
Jul. 02, 2023
Jul. 03, 2022
Jan. 01, 2023
Revenue from Contract with Customer, Excluding Assessed Tax $ 2,921 $ 4,541   $ 7,054 $ 8,637  
Contract with Customer, Liability, Current 294     294   $ 272
UNITED STATES            
Revenue from Contract with Customer, Excluding Assessed Tax $ 2,300 $ 3,000   $ 5,600 $ 5,500  
Percentage of Revenue 80.00% 67.00%   80.00% 63.00%  
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 $ 1,900 $ 1,600        
Professional Services [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax   1,500        
Contract with Customer, Liability, Current $ 294 $ 0   $ 294 $ 0  
SaaS Revenue [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax     $ 100      
Engineering Services [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax       $ 1,000 $ 300