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Note 9 - Information Concerning Product Lines, Geographic Information and Revenue Concentration - Customer and Distributor Concentration (Details) - Customer Concentration Risk [Member]
3 Months Ended 6 Months Ended
Jul. 03, 2022
Jul. 04, 2021
Jul. 03, 2022
Jul. 04, 2021
Revenue Benchmark [Member] | Distributor "A" [Member]        
Concentration risk percentage 15.00% 14.00% 13.00% 13.00%
Revenue Benchmark [Member] | Distributor "C" [Member]        
Concentration risk percentage       16.00%
Revenue Benchmark [Member] | Distributor "E" [Member]        
Concentration risk percentage 11.00% 29.00% 20.00% 29.00%
Revenue Benchmark [Member] | Customer "E" [Member]        
Concentration risk percentage 11.00%     20.00%
Revenue Benchmark [Member] | Customer "F" [Member]        
Concentration risk percentage 11.00% 29.00%   29.00%
Revenue Benchmark [Member] | Customer "N" [Member]        
Concentration risk percentage 29.00%   23.00%  
Revenue Benchmark [Member] | Customer "O" [Member]        
Concentration risk percentage 16.00%   21.00%  
Revenue Benchmark [Member] | Customer P [Member]        
Concentration risk percentage     11.00%  
Accounts Receivable [Member] | Distributor "A" [Member]        
Concentration risk percentage     13.00% 42.00%
Accounts Receivable [Member] | Distributor "C" [Member]        
Concentration risk percentage       17.00%
Accounts Receivable [Member] | Distributor "E" [Member]        
Concentration risk percentage       22.00%
Accounts Receivable [Member] | Distributor "J" [Member]        
Concentration risk percentage     36.00%  
Accounts Receivable [Member] | Customer "O" [Member]        
Concentration risk percentage     29.00% 10.00%