Note 14 - Information Concerning Product Lines, Geographic Information and Revenue Concentration - Customer and Distributor Concentration (Details) - Customer Concentration Risk [Member]	12 Months Ended
	Jan. 02, 2022	Jan. 03, 2021	Dec. 29, 2019
Revenue Benchmark [Member] | Distributor "A" [Member]
Concentration risk percentage	15.00%	24.00%	40.00%
Revenue Benchmark [Member] | Distributor "C" [Member]
Concentration risk percentage	11.00%	15.00%	13.00%
Revenue Benchmark [Member] | Distributor "E" [Member]
Concentration risk percentage	22.00%	19.00%
Revenue Benchmark [Member] | Customer "B" [Member]
Concentration risk percentage	8.00%	10.00%	13.00%
Revenue Benchmark [Member] | Customer "O" [Member]
Concentration risk percentage	14.00%	16.00%
Revenue Benchmark [Member] | Customer "E" [Member]
Concentration risk percentage	10.00%		10.00%
Revenue Benchmark [Member] | Customer "N" [Member]
Concentration risk percentage	16.00%
Accounts Receivable [Member] | Distributor "A" [Member]
Concentration risk percentage	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] | Customer "O" [Member]
Concentration risk percentage	10.00%
Accounts Receivable [Member] | Customer P [Member]
Concentration risk percentage		67.00%
Accounts Receivable [Member] | Customer Q [Member]
Concentration risk percentage		10.00%