Note 10 - Segment and Geographic Information - Customers Comprising 10% of Consolidated Sales (Details)	12 Months Ended
	Dec. 28, 2019
Semiconductor Equipment [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Intel [Member]
Net sales percentage	11.10%	[1]

[1] No single customer exceeded 10% of consolidated net sales for the years ended December 26, 2020 and December 29, 2018.