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Note 2 - Goodwill and Purchased Intangible Assets (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2022
Notes Tables |
Schedule of Goodwill [Table Text Block] |
|  | Semiconductor Test & Inspection |  |  | PCB Test |  |  | Total Goodwill |
Balance December 26, 2020 |  | $ | 230,724 |  |  | $ | 21,580 |  |  | $ | 252,304 |
Sale of PCB Test Business (1) |  |  | - |  |  |  | (21,899 | ) |  |  | (21,899 | )
Impact of currency exchange |  |  | (10,933 | ) |  |  | 319 |  |  |  | (10,614 | )
Balance December 25, 2021 |  |  | 219,791 |  |  |  | - |  |  |  | 219,791 |
Impact of currency exchange |  |  | (6,252 | ) |  |  | - |  |  |  | (6,252 | )
Balance December 31, 2022 |  | $ | 213,539 |  |  | $ | - |  |  | $ | 213,539 |
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Table Text Block] |
|  | December 31, 2022 |  |  | December 25, 2021 |
|  |  |  |  |  |  |  |  |  | Remaining |  |  |  |  |  |  |  |  |
|  | Gross Carrying |  |  | Accumulated |  |  | Useful Life |  |  | Gross Carrying |  |  | Accumulated |
|  | Amount |  |  | Amortization |  |  | (years) |  |  | Amount |  |  | Amortization |
Developed technology |  | $ | 224,253 |  |  | $ | 128,938 |  |  |  | 3.6 |  |  | $ | 229,131 |  |  | $ | 104,855 |
Customer relationships |  |  | 64,632 |  |  |  | 31,015 |  |  |  | 6.5 |  |  |  | 65,916 |  |  |  | 26,189 |
Trade names |  |  | 20,461 |  |  |  | 9,397 |  |  |  | 6.4 |  |  |  | 20,877 |  |  |  | 7,714 |
Covenant not-to-compete |  |  | 269 |  |  |  | 161 |  |  |  | 4.0 |  |  |  | 308 |  |  |  | 154 |
|  | $ | 309,615 |  |  | $ | 169,511 |  |  |  |  |  |  | $ | 316,232 |  |  | $ | 138,912 |

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