Note 3 - Revenue From Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Jan. 01, 2022	Jan. 02, 2021
Revenue	$ 660,356	$ 515,327	$ 408,120
Percentage of revenue	100.00%	100.00%	100.00%
UNITED STATES
Revenue	$ 94,972	$ 60,176	$ 43,945
Percentage of revenue	14.00%	12.00%	11.00%
Other Americas [Member]
Revenue	$ 5,288	$ 20,694	$ 18,192
Percentage of revenue	1.00%	4.00%	4.00%
Americas [Member]
Revenue	$ 100,260	$ 80,870	$ 62,137
Percentage of revenue	15.00%	16.00%	15.00%
CHINA
Revenue	$ 296,917	$ 281,237	$ 213,714
Percentage of revenue	45.00%	55.00%	52.00%
JAPAN
Revenue	$ 90,902	$ 47,915	$ 25,435
Percentage of revenue	14.00%	9.00%	6.00%
Other Asia [Member]
Revenue	$ 77,085	$ 55,416	$ 66,034
Percentage of revenue	12.00%	10.00%	17.00%
Asia [Member]
Revenue	$ 464,904	$ 384,568	$ 305,183
Percentage of revenue	71.00%	74.00%	75.00%
Europe [Member]
Revenue	$ 95,192	$ 49,889	$ 40,800
Percentage of revenue	14.00%	10.00%	10.00%
Product [Member] | Sales Channel, Through Intermediary [Member]
Revenue	$ 591,229	$ 449,650	$ 339,100
Percentage of revenue	89.00%	87.00%	83.00%
Product [Member] | Sales Channel, Directly to Consumer [Member]
Revenue	$ 51,988	$ 45,202	$ 49,402
Percentage of revenue	8.00%	9.00%	12.00%
License and Service [Member]
Revenue	$ 17,139	$ 20,475	$ 19,618
Percentage of revenue	3.00%	4.00%	5.00%