Note 10 - Income Taxes (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Dec. 30, 2023	Dec. 31, 2023	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Deferred Tax Assets, Valuation Allowance	$ 99,888		$ 99,888	$ 89,234
Increase (Decrease) of Net Income Due to Impact of Tax Holidays			$ 3,800	$ 4,500	$ 4,500
Increase (Decrease) of Earning Per Share Due To Impact Of Tax Holidays (in dollars per share)			$ 0.08	$ 0.09	$ 0.09
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	7,500		$ 7,500	$ 5,800	$ 5,300
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	700		700	600
Unrecognized Tax Benefits, Interest Expense, Net of Accrued Interest Reversed		$ (100)		$ (100)	$ (200)
Maximum [Member]
Unrecognized Tax Benefits, Increase (Decrease) Related to Transfer Pricing	1,100
Collection Term Range (Year)				10 years
Minimum [Member]
Collection Term Range (Year)				4 years
Domestic Tax Authority [Member]
Operating Loss Carryforwards	120,900		120,900
Tax Credit Carryforward, Amount	4,000		4,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	130,100		130,100
Tax Credit Carryforward, Amount	33,700		33,700
Foreign Tax Authority [Member]
Operating Loss Carryforwards	$ 13,200		$ 13,200