Note 1 - Summary of Significant Accounting Policies - Reported Share-based Compensation in Consolidated Financial Statements (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 24, 2022	Sep. 25, 2021	Sep. 24, 2022	Sep. 25, 2021
Share-based compensation of continuing operations	$ 3,740	$ 3,714	$ 11,095	$ 10,743
Income tax benefit	(770)	(155)	(3,232)	(569)
Total share-based compensation, net	2,970	3,559	7,863	10,174
Cost of Sales [Member]
Share-based compensation of continuing operations	161	239	478	692
Research and Development Expense [Member]
Share-based compensation of continuing operations	755	889	2,333	2,433
Selling, General and Administrative Expenses [Member]
Share-based compensation of continuing operations	$ 2,824	$ 2,586	$ 8,284	$ 7,618

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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