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Note 11 - Segment and Geographic Information - Summary of Current Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 27, 2025
Dec. 28, 2024
Dec. 30, 2023
Net sales $ 452,956 $ 401,779 $ 636,322
Cost of sales [1] 259,337 221,485 333,454
Research and development 92,213 84,797 88,571
Amortization of purchased intangible assets 37,466 39,087 36,355
Stock-based compensation 23,042 20,740 17,237
Income (loss) before taxes (62,407) (64,946) 45,816
Semiconductor Test & Inspection Segment [Member]      
Net sales 452,956 401,779 636,322
Cost of sales 257,941 220,436 332,609
Research and development 86,756 81,231 85,178
Selling 53,028 51,584 61,056
General & administrative 54,349 60,328 58,196
Amortization of purchased intangible assets 37,466 39,087 36,355
Stock-based compensation 23,042 20,740 17,237
Other segment items [2] 2,781 (6,681) (125)
Income (loss) before taxes $ (62,407) $ (64,946) $ 45,816
[1] Excludes amortization of purchased intangibles of $28,086, $30,008, and $28,418 for the years ended December 27, 2025, December 28, 2024, and December 30, 2023, respectively.
[2] (1) Other segment items include restructuring charges as well as miscellaneous non-operating items.