Note 2 - Net Income Per Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jul. 02, 2022	Jul. 01, 2023	Jul. 02, 2022
Net income	$ 50,644	$ 44,532	$ 106,567	$ 80,610
Shares used in basic Net income per share (in shares)	137,735	137,424	137,573	137,462
Dilutive effect of stock options, RSUs, ESPP shares, and equity awards with a market condition or performance condition (in shares)	2,033	2,746	2,393	3,195
Shares used in diluted Net income per share (in shares)	139,768	140,170	139,966	140,657
Basic (in dollars per share)	$ 0.37	$ 0.32	$ 0.77	$ 0.59
Diluted (in dollars per share)	$ 0.36	$ 0.32	$ 0.76	$ 0.57
Stock options, RSUs, ESPP shares, and equity awards with a market condition or performance condition excluded as they are antidilutive (in shares)	158	558	115	442