Note 3 - Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 27, 2025	Sep. 28, 2024
Revenue	$ 133,349	$ 127,091	$ 377,470	$ 391,982
Percentage of revenue	100.00%	100.00%	100.00%	100.00%
CHINA
Revenue	$ 64,805	$ 49,671	$ 185,636	$ 154,702
Percentage of revenue	49.00%	39.00%	49.00%	39.00%
JAPAN
Revenue	$ 7,301	$ 16,633	$ 24,279	$ 64,782
Percentage of revenue	5.00%	13.00%	6.00%	17.00%
Other Asia [Member]
Revenue	$ 14,605	$ 13,508	$ 37,511	$ 35,375
Percentage of revenue	11.00%	11.00%	10.00%	9.00%
Asia [Member]
Revenue	$ 86,711	$ 79,812	$ 247,426	$ 254,859
Percentage of revenue	65.00%	63.00%	65.00%	65.00%
Americas [Member]
Revenue	$ 24,871	$ 19,156	$ 81,751	$ 74,745
Percentage of revenue	19.00%	15.00%	22.00%	19.00%
Europe [Member]
Revenue	$ 21,767	$ 28,123	$ 48,293	$ 62,378
Percentage of revenue	16.00%	22.00%	13.00%	16.00%
Sales Channel, Through Intermediary [Member] | Product [Member]
Revenue	$ 110,992	$ 120,266	$ 309,339	$ 356,001
Percentage of revenue	83.00%	95.00%	82.00%	91.00%
Sales Channel, Directly to Consumer [Member] | Product [Member]
Revenue	$ 22,357	$ 6,825	$ 68,131	$ 35,981
Percentage of revenue	17.00%	5.00%	18.00%	9.00%