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Note 10 - Segment and Geographic Information - Summary of Current Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 27, 2026 | Jun. 28, 2025 | Jun. 27, 2026 | Jun. 28, 2025
Net sales |  | $ 149,002 | $ 107,680 | $ 274,121 | $ 204,477
Cost of sales | [1] | 81,412 | 60,571 | 148,626 | 115,051
Research and development |  | 24,943 | 23,188 | 51,330 | 46,340
Amortization of purchased intangible assets |  | 7,277 | 10,081 | 14,577 | 19,933
Stock-based compensation |  | 6,593 | 5,675 | 12,869 | 11,905
Income (loss) before taxes |  | 1,989 | (14,831) | (7,024) | (40,797)
Semiconductor Test & Inspection Segment [Member] |  |  |  |  |
Net sales |  | 149,002 | 107,680 | 274,121 | 204,477
Cost of sales |  | 81,193 | 60,173 | 148,133 | 114,327
Research and development |  | 23,870 | 21,674 | 49,289 | 43,607
Selling |  | 14,521 | 13,320 | 29,229 | 26,445
General & administrative |  | 14,623 | 12,783 | 29,482 | 24,984
Amortization of purchased intangible assets |  | 7,277 | 10,081 | 14,577 | 19,933
Stock-based compensation |  | 6,593 | 5,675 | 12,869 | 11,905
Other segment items | [2] | (1,064) | (1,195) | (2,434) | 4,073
Income (loss) before taxes |  | $ 1,989 | $ (14,831) | $ (7,024) | $ (40,797)
[1] | Excludes amortization of purchased intangibles of $4,916 and $7,739 for the three months ended June 27, 2026, and June 28, 2025, respectively, and $9,847 and $15,298 for the six months ended June 27, 2026, and June 28, 2025, respectively.
[2] | Other segment items include restructuring charges as well as miscellaneous non-operating items.

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