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Note 10 - Segment and Geographic Information - Summary of Current Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 27, 2025
Sep. 28, 2024
Sep. 27, 2025
Sep. 28, 2024
Net sales $ 126,249 $ 95,342 $ 330,726 $ 307,657
Cost of sales [1] 70,985 50,685 186,036 166,829
Research and development 22,454 20,324 68,794 64,002
Amortization of purchased intangible assets 10,249 9,791 30,182 29,334
Stock-based compensation 5,659 5,248 17,564 15,459
Loss before taxes (7,815) (14,825) (48,612) (45,643)
Semiconductor Test & Inspection Segment [Member]        
Net sales 126,249 95,342 330,726 307,657
Cost of sales 70,644 50,415 184,971 166,070
Research and development 21,098 19,559 64,705 61,402
Selling 13,274 12,345 39,719 39,870
General & administrative 14,532 13,739 39,516 45,527
Amortization of purchased intangible assets 10,249 9,791 30,182 29,334
Stock-based compensation 5,659 5,248 17,564 15,459
Other segment items (1) [2] (1,392) (930) 2,681 (4,362)
Loss before taxes $ (7,815) $ (14,825) $ (48,612) $ (45,643)
[1] Excludes amortization of purchased intangibles of $7,873 and $7,518 for the three months ended September 27, 2025, and September 28, 2024, respectively, and $23,171 and $22,526 for the nine months ended September 27, 2025, and September 28, 2024, respectively.
[2] Other segment items include restructuring charges as well as miscellaneous non-operating items.