Note 2 - Net Income Per Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Oct. 01, 2022	Sep. 30, 2023	Oct. 01, 2022
Net income	$ 53,788	$ 46,359	$ 160,355	$ 126,969
Shares used in basic Net income per share (in shares)	137,948	137,267	137,697	137,397
Dilutive effect of stock options, RSUs, ESPP shares, and equity awards with a market condition or performance condition (in shares)	1,880	2,668	2,230	3,524
Shares used in diluted Net income per share (in shares)	139,828	139,935	139,927	140,921
Basic (in dollars per share)	$ 0.39	$ 0.34	$ 1.16	$ 0.92
Diluted (in dollars per share)	$ 0.38	$ 0.33	$ 1.15	$ 0.90
Stock options, RSUs, ESPP shares, and equity awards with a market condition or performance condition excluded as they are antidilutive (in shares)	448	604	223	535