Note 14 - Information Concerning Product Lines, Geographic Information, Accounts Receivable and Revenue Concentration - Customer and Distributor Concentration (Details) - Customer Concentration Risk [Member]	12 Months Ended
	Jan. 03, 2021	Dec. 29, 2019	Dec. 30, 2018
Distributor "A" [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	24.00%	40.00%	34.00%
Distributor "A" [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage		20.00%
Distributor "C" [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	15.00%	13.00%
Distributor "C" [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage		23.00%
Distributor "E" [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	19.00%
Distributor "E" [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage		12.00%
Customer "B" [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	10.00%	13.00%	12.00%
Distributor "J" [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage		31.00%
Customer "E" [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage		10.00%
Customer P [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage	67.00%
Customer "F" [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	19.00%
Customer Q [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage	10.00%
Customer G [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage			10.00%
Customer "J" [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage			10.00%
Customer "M" [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	16.00%