Note 2 - Business Acquisitions, Goodwill and Purchased Intangible Assets - Purchased Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 26, 2026	Dec. 27, 2025
Gross Carrying Amount, finite-lived intangible assets	$ 335,179	$ 339,306
Accumulated Amortization	278,166	260,034
Developed Technology Rights [Member]
Gross Carrying Amount, finite-lived intangible assets	238,081	241,038
Accumulated Amortization	$ 211,708	199,776
Finite-Lived Intangible Asset, Useful Life (Year)	3 years 6 months
Customer Relationships [Member]
Gross Carrying Amount, finite-lived intangible assets	$ 74,941	75,677
Accumulated Amortization	$ 49,091	44,210
Finite-Lived Intangible Asset, Useful Life (Year)	4 years 9 months 18 days
Trade Names [Member]
Gross Carrying Amount, finite-lived intangible assets	$ 21,933	22,366
Accumulated Amortization	$ 17,150	15,845
Finite-Lived Intangible Asset, Useful Life (Year)	4 years 4 months 24 days
Noncompete Agreements [Member]
Gross Carrying Amount, finite-lived intangible assets	$ 224	225
Accumulated Amortization	$ 217	$ 203
Finite-Lived Intangible Asset, Useful Life (Year)	3 months 18 days