Note 3 - Revenue From Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2022	Apr. 03, 2021
Revenue	$ 150,515	$ 115,716
Percentage of revenue	100.00%	100.00%
UNITED STATES
Revenue	$ 17,703	$ 9,110
Percentage of revenue	12.00%	8.00%
Other Americas [Member]
Revenue	$ 3,837	$ 6,733
Percentage of revenue	3.00%	6.00%
Americas [Member]
Revenue	$ 21,540	$ 15,843
Percentage of revenue	15.00%	14.00%
CHINA
Revenue	$ 75,431	$ 67,119
Percentage of revenue	50.00%	58.00%
JAPAN
Revenue	$ 18,903	$ 7,777
Percentage of revenue	13.00%	7.00%
Other Asia [Member]
Revenue	$ 14,418	$ 13,494
Percentage of revenue	9.00%	11.00%
Asia [Member]
Revenue	$ 108,752	$ 88,390
Percentage of revenue	72.00%	76.00%
Europe [Member]
Revenue	$ 20,223	$ 11,483
Percentage of revenue	13.00%	10.00%
Product [Member] | Sales Channel, Through Intermediary [Member]
Revenue	$ 135,413	$ 98,779
Percentage of revenue	90.00%	85.00%
Product [Member] | Sales Channel, Directly to Consumer [Member]
Revenue	$ 11,565	$ 12,813
Percentage of revenue	8.00%	11.00%
License and Service [Member]
Revenue	$ 3,537	$ 4,124
Percentage of revenue	2.00%	4.00%