Note 10 - Income Taxes - Reconciliation of Income Tax Computed at U.S. Federal Statutory Tax Rate to Provision (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Tax provision at U.S. 21% statutory rate	$ (13,638)	$ 9,470	$ 26,610
State income taxes, net of federal tax benefit	(2,126)	(633)	(1,535)
Accruals, adjustments and releases from statute expirations	(2,372)	579	348
Federal R&D credits	(1,103)	(1,360)	(1,679)
Stock-based compensation	502	(1,504)	(572)
Excess executive compensation	715	1,375	946
Change in valuation allowance	14,844	10,654	13,307
GILTI, net of foreign tax credits	2,613	1,735	3,458
Foreign rate differential	146	2,093	(6,131)
Withholding and other foreign taxes, net of foreign tax credit	1,206	254	(3,819)
Other, net	4,085	(5,003)	(1,065)
Income Tax Expense (Benefit)	$ 4,872	$ 17,660	$ 29,868