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Note 10 - Segment and Geographic Information - Summary of Current Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 28, 2026
Mar. 29, 2025
Net sales $ 125,119 $ 96,797
Cost of sales [1] 67,214 54,480
Research and development 26,387 23,152
Amortization of purchased intangible assets 7,300 9,852
Stock-based compensation 6,276 6,230
Income (loss) before taxes (9,013) (25,966)
Semiconductor Test & Inspection Segment [Member]    
Net sales 125,119 96,797
Cost of sales 66,940 54,155
Research and development 25,419 21,933
Selling 14,708 13,124
General & administrative 14,859 12,201
Amortization of purchased intangible assets 7,300 9,852
Stock-based compensation 6,276 6,230
Other segment items [2] (1,370) 5,268
Income (loss) before taxes $ (9,013) $ (25,966)
[1] Excludes amortization of purchased intangibles of $4,931 and $7,559 for the three months ended March 28, 2026, and March 29, 2025, respectively.
[2] Other segment items include restructuring charges as well as miscellaneous non-operating items.