Note 2 - Business Acquisitions, Goodwill and Purchased Intangible Assets - Purchase Price Allocation (Details) - USD ($) $ in Thousands	Mar. 28, 2026	Dec. 27, 2025	[1]	Jan. 07, 2025	Dec. 28, 2024
Goodwill	$ 280,253	$ 283,027			$ 234,639
Tignis, Inc [Member]
Current assets, including cash received				$ 293
Property, plant and equipment				19
Other assets				56
Intangible assets				2,900
Goodwill				33,688
Total assets acquired				36,956
Liabilities assumed				(349)
Net assets acquired				$ 36,607

[1] Derived from December 27, 2025, audited financial statements