Note 12 - Income Taxes - Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Statutory federal rate	21.00%	21.00%	21.00%
State taxes, net	(8.00%)	(1.00%)	(2.00%)
Federal tax credits	(16.00%)	(4.00%)	(1.00%)
Stock-based compensation	9.00%	(2.00%)
Foreign rate differential	(25.00%)	(15.00%)	(16.00%)
U.S. tax on foreign operations	18.00%	9.00%	33.00%
Capital loss expiration			1.00%
Valuation allowance	10.00%	(29.00%)	(33.00%)
Change in uncertain tax benefit accrual	(75.00%)		(2.00%)
Other	(3.00%)		1.00%
Effective income tax rate	(69.00%)	(21.00%)	2.00%