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Note 10 - Income Taxes (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 27, 2025	Dec. 28, 2024	Dec. 30, 2023
Deferred Tax Assets, Valuation Allowance	$ 143,482	$ 114,517
Increase (Decrease) of Net Income Due to Impact of Tax Holidays	$ 800	$ 1,000	$ 3,800
Increase (Decrease) of Earning Per Share Due To Impact Of Tax Holidays (in dollars per share)	$ 0.02	$ 0.02	$ 0.08
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 3,500	$ 5,200	$ 7,500
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	500	500
Unrecognized Tax Benefits, Interest Expense, Net of Accrued Interest Reversed	$ (300)	(200)	$ (100)
Minimum [Member]
Collection Term Range (Year)	4 years
Maximum [Member]
Collection Term Range (Year)	10 years
Domestic Tax Jurisdiction [Member]
Operating Loss Carryforwards	$ 244,800
Tax Credit Carryforward, Amount	$ 6,100
Open Tax Year	2022 2023 2024 2025
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	$ 132,300
Tax Credit Carryforward, Amount		$ 28,900
Open Tax Year	2020 2021 2022 2023 2024 2025
Foreign Tax Jurisdiction [Member]
Operating Loss Carryforwards	$ 17,400

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-Section 50
-Paragraph 2
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