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Note 1 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2025	Dec. 28, 2024	Dec. 30, 2023
Net sales	$ 452,956	$ 401,779	$ 636,322
Systems [Member] | Semiconductor Test and Inspection [Member]
Net sales	180,627	139,133	326,448
Non-systems [Member] | Semiconductor Test and Inspection [Member]
Net sales	$ 272,329	$ 262,646	$ 309,874

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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