Note 10 - Segment and Geographic Information - Customers Comprising 10% of Consolidated Sales (Details) - Semiconductor Equipment [Member] - Revenue Benchmark [Member] - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 25, 2021	Dec. 28, 2019
Analog Devices [Member]
Net sales percentage	14.10%
Intel [Member]
Net sales percentage		11.10%