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. 27, 2025	Sep. 27, 2025	Sep. 28, 2024	Sep. 28, 2024	Sep. 27, 2025	Sep. 28, 2024
Net income	$ 2,794	$ 2,794	$ 7,190	$ 7,190	$ 10,729	$ 44,617
Shares used in basic Net income per share (in shares)		136,877	137,709		137,224	137,577
Dilutive effect of employee equity incentive awards (in shares)		1,226	185		845	697
Shares used in diluted Net income per share (in shares)		138,103	137,894		138,069	138,274
Basic (in dollars per share)		$ 0.02	$ 0.05		$ 0.08	$ 0.32
Diluted (in dollars per share)		$ 0.02	$ 0.05		$ 0.08	$ 0.32