Note 9 - Segment and Geographic Information - Customers Comprising 10% of Consolidated Sales (Details) - Semiconductor Equipment [Member] - Sales Revenue, Net [Member] - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Intel [Member]
Net sales percentage	11.20%	17.20%
NXP Semiconductors N.V. [Member]
Net sales percentage	15.90%	13.70%