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Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
(in thousands) |  | 2022 |  |  | 2021 |  |  | 2020 |
Weighted average common shares outstanding |  |  | 48,178 |  |  |  | 47,409 |  |  |  | 41,854 |
Effect of dilutive stock options and restricted stock units |  |  | 621 |  |  |  | 1,051 |  |  |  | - |
|  |  | 48,799 |  |  |  | 48,460 |  |  |  | 41,854 |
Schedule of Inventory, Current [Table Text Block] |
|  | December 31, |  |  | December 25, |
|  | 2022 |  |  | 2021 |
Raw materials and purchased parts |  | $ | 106,041 |  |  | $ | 92,798 |
Work in process |  |  | 36,024 |  |  |  | 40,732 |
Finished goods |  |  | 28,076 |  |  |  | 27,523 |
Total inventories |  | $ | 170,141 |  |  | $ | 161,053 |
Property, Plant and Equipment [Table Text Block] |
|  | December 31, |  |  | December 25, |
|  | 2022 |  |  | 2021 |
Land and land improvements |  | $ | 7,066 |  |  | $ | 7,703 |
Buildings and building improvements |  |  | 31,161 |  |  |  | 31,711 |
Machinery and equipment |  |  | 105,109 |  |  |  | 95,542 |
|  |  | 143,336 |  |  |  | 134,956 |
Less accumulated depreciation and amortization |  |  | (78,325 | ) |  |  | (70,999 | )
Property, plant and equipment, net |  | $ | 65,011 |  |  | $ | 63,957 |
Disaggregation of Revenue [Table Text Block] |
(in thousands) |  | 2022 |  |  | 2021 |  |  | 2020 |
Systems-Semiconductor Test & Inspection |  | $ | 474,655 |  |  | $ | 541,589 |  |  | $ | 317,821 |
Non-systems-Semiconductor Test & Inspection |  |  | 338,120 |  |  |  | 318,865 |  |  |  | 267,419 |
Systems-PCB Test |  |  | - |  |  |  | 17,831 |  |  |  | 33,293 |
Non-systems-PCB Test |  |  | - |  |  |  | 8,929 |  |  |  | 17,474 |
Net sales |  | $ | 812,775 |  |  | $ | 887,214 |  |  | $ | 636,007 |

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