Note 2 - Goodwill and Purchased Intangible Assets - Purchased Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2020	Dec. 28, 2019
Gross Carrying Amount, finite-lived intangible assets	$ 323,599	$ 322,804
Accumulated Amortization	88,280	68,617
Developed Technology Rights [Member]
Gross Carrying Amount, finite-lived intangible assets	228,544	227,619
Accumulated Amortization	$ 65,035	49,805
Remaining Useful Life (Year)	6 years 2 months 12 days
Customer Relationships [Member]
Gross Carrying Amount, finite-lived intangible assets	$ 71,965	72,251
Accumulated Amortization	$ 18,152	14,824
Remaining Useful Life (Year)	8 years 10 months 24 days
Trade Names [Member]
Gross Carrying Amount, finite-lived intangible assets	$ 22,761	22,612
Accumulated Amortization	$ 4,978	3,892
Remaining Useful Life (Year)	9 years 1 month 6 days
Noncompete Agreements [Member]
Gross Carrying Amount, finite-lived intangible assets	$ 329	322
Accumulated Amortization	$ 115	$ 96
Remaining Useful Life (Year)	6 years 6 months