Note 3 - Goodwill and Purchased Intangible Assets (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Transfer From In-Process Technology to Developed Technology	$ 15,300
Amortization of Intangible Assets, Total	39,590	$ 17,197	$ 4,208
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	38,400
Finite-Lived Intangible Assets, Amortization Expense, Year Two	34,800
Finite-Lived Intangible Assets, Amortization Expense, Year Three	34,800
Finite-Lived Intangible Assets, Amortization Expense, Year Four	34,800
Finite-Lived Intangible Assets, Amortization Expense, Year Five	34,800
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	76,800
In-process Technology [Member]
Indefinite-lived Intangible Assets (Excluding Goodwill), Ending Balance	$ 20,800	$ 36,300