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Note 2 - Business Acquisitions, Goodwill and Purchased Intangible Assets (Details Textual) $ in Thousands, SDG in Millions, $ in Millions			1 Months Ended		3 Months Ended		9 Months Ended
	Oct. 02, 2023 USD ($)	Oct. 02, 2023 SGD ($)	Jan. 31, 2024 USD ($)	Jan. 31, 2024 SGD ($)	Sep. 28, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 28, 2024 USD ($)	Sep. 28, 2024 SGD ($)	Sep. 30, 2023 USD ($)	Sep. 28, 2024 SDG	Dec. 30, 2023 USD ($)	[1]	Oct. 02, 2023 SDG
Other Accrued Liabilities, Noncurrent					$ 7,188		$ 7,188				$ 8,262
Amortization of Intangible Assets					9,791	$ 8,857	29,334		$ 26,617
Equiptest Engineering Pte Ltd. (“EQT”) [Member]
Payments to Acquire Businesses, Gross	$ 48,300	$ 66.0
Business Combination, Consideration Transferred	49,900	$ 68.3					50,300	$ 68.8
Cash Acquired from Acquisition			$ 600	$ 0.8
Equiptest Engineering Pte Ltd. (“EQT”) [Member] | EQT Retention Sum Liability [Member]
Business Combination, Retention Sum Liability for Potential Adjustments	$ 1,600												SDG 2.2
Other Accrued Liabilities, Noncurrent					$ 800		$ 800			SDG 1.1
[1] Derived from December 30, 2023 audited financial statements

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In reference to the Retention Sum Liability for Potential Adjustments in relation to Business Acquisitions.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

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Amount of expenses incurred but not yet paid classified as other, due after one year or the normal operating cycle, if longer.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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