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Note 1 - Basis of Presentation (Details Textual) - Sell-through Distributors Concentration Risk [Member]
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 03, 2021
Jun. 27, 2020
Jul. 03, 2021
Jun. 27, 2020
Jan. 02, 2021
Revenue Benchmark [Member]          
Number of Distributors     2   2
Revenue Benchmark [Member] | Distributors [Member]          
Concentration Risk, Percentage 88.00% 85.00% 87.00% 81.00%  
Accounts Receivable [Member] | Large Distributor One [Member]          
Concentration Risk, Percentage     47.00%   47.00%
Accounts Receivable [Member] | Large Distributor Two [Member]          
Concentration Risk, Percentage     36.00%   45.00%