Note 9 - Stock-based Compensation - Stock-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Total stock-based compensation	$ 11,920	$ 11,012	$ 22,374	$ 19,740
Cost of Sales [Member]
Total stock-based compensation	825	897	1,491	1,488
Research and Development Expense [Member]
Total stock-based compensation	3,969	2,234	6,736	4,828
Selling, General and Administrative Expenses [Member]
Total stock-based compensation	$ 7,126	$ 7,881	$ 14,147	$ 13,424

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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