Note 10 - Segment and Geographic Information - Summary of Current Segments (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
Sep. 26, 2026 |
Sep. 27, 2025 |
Sep. 26, 2026 |
Sep. 27, 2025 |
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| Net sales | $ 172,956 | $ 126,249 | $ 447,077 | $ 330,726 | ||||
| Cost of sales | [1] | 94,237 | 70,985 | 242,863 | 186,036 | |||
| Research and development | 25,558 | 22,454 | 76,888 | 68,794 | ||||
| Amortization of purchased intangible assets | 7,177 | 10,249 | 21,754 | 30,182 | ||||
| Share-based compensation | 4,625 | 5,659 | 17,494 | 17,564 | ||||
| Income (loss) before taxes | 14,323 | (7,815) | 7,299 | (48,612) | ||||
| Semiconductor Test & Inspection Segment [Member] | ||||||||
| Net sales | 172,956 | 126,249 | 447,077 | 330,726 | ||||
| Cost of sales | 93,963 | 70,644 | 242,096 | 184,971 | ||||
| Research and development | 24,464 | 21,098 | 73,753 | 64,705 | ||||
| Selling | 13,892 | 13,274 | 43,121 | 39,719 | ||||
| General & administrative | 15,599 | 14,532 | 45,081 | 39,516 | ||||
| Amortization of purchased intangible assets | 7,177 | 10,249 | 21,754 | 30,182 | ||||
| Share-based compensation | 4,625 | 5,659 | 17,494 | 17,564 | ||||
| Other segment items | [2] | (1,087) | (1,392) | (3,521) | 2,681 | |||
| Income (loss) before taxes | $ 14,323 | $ (7,815) | $ 7,299 | $ (48,612) | ||||
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| X | ||||||||||
- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of amortization expense for finite-lived intangible asset. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Cost of product sold and service rendered, excluding depreciation, depletion, and amortization. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of expense for research and development. Includes, but is not limited to, cost for computer software product to be sold, leased, or otherwise marketed and writeoff of research and development assets acquired in transaction other than business combination or joint venture formation or both. Excludes write-down of intangible asset acquired in business combination or from joint venture formation or both, used in research and development activity. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition 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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of other expense (income) and loss (gain) calculated as difference between segment revenue and separately disclosed expense category to arrive at segment profit (loss). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Expenses recognized in the period that are directly related to the selling and distribution of products or services. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Details
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