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Note 1 - Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 28, 2024
Notes Tables |
Schedule of Inventory, Current [Table Text Block] |
|  | September 28, |  |  | December 30, |
|  | 2024 |  |  | 2023 |
Raw materials and purchased parts |  | $ | 95,961 |  |  | $ | 103,118 |
Work in process |  |  | 25,572 |  |  |  | 26,820 |
Finished goods |  |  | 22,592 |  |  |  | 25,855 |
Total inventories |  | $ | 144,125 |  |  | $ | 155,793 |
Property, Plant and Equipment [Table Text Block] |
|  | September 28, |  |  | December 30, |
|  | 2024 |  |  | 2023 |
Land and land improvements |  | $ | 7,372 |  |  | $ | 7,301 |
Buildings and building improvements |  |  | 47,963 |  |  |  | 39,677 |
Machinery and equipment |  |  | 107,230 |  |  |  | 108,831 |
|  |  | 162,565 |  |  |  | 155,809 |
Less accumulated depreciation and amortization |  |  | (85,899 | ) |  |  | (86,724 | )
Property, plant and equipment, net |  | $ | 76,666 |  |  | $ | 69,085 |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 28, |  |  | September 30, |  |  | September 28, |  |  | September 30, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Cost of sales |  | $ | 270 |  |  | $ | 223 |  |  | $ | 759 |  |  | $ | 619 |
Research and development |  |  | 765 |  |  |  | 849 |  |  |  | 2,600 |  |  |  | 2,534 |
Selling, general and administrative |  |  | 4,213 |  |  |  | 3,262 |  |  |  | 12,100 |  |  |  | 9,527 |
Total share-based compensation |  |  | 5,248 |  |  |  | 4,334 |  |  |  | 15,459 |  |  |  | 12,680 |
Income tax effect |  |  | 12 |  |  |  | (45 | ) |  |  | 223 |  |  |  | (2,883 | )
Total share-based compensation, net |  | $ | 5,260 |  |  | $ | 4,289 |  |  | $ | 15,682 |  |  | $ | 9,797 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 28, |  |  | September 30, |  |  | September 28, |  |  | September 30, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Weighted average common shares |  |  | 46,815 |  |  |  | 47,615 |  |  |  | 46,971 |  |  |  | 47,525 |
Effect of dilutive securities |  |  | - |  |  |  | 492 |  |  |  | - |  |  |  | 577 |
|  |  | 46,815 |  |  |  | 48,107 |  |  |  | 46,971 |  |  |  | 48,102 |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
Disaggregated Net Sales |  | September 28, 2024 |  |  | September 30, 2023 |  |  | September 28, 2024 |  |  | September 30, 2023 |
Systems |  | $ | 31,102 |  |  | $ | 73,173 |  |  | $ | 103,685 |  |  | $ | 263,469 |
Non-systems |  |  | 64,240 |  |  |  | 77,631 |  |  |  | 203,972 |  |  |  | 235,627 |
Total net sales |  | $ | 95,342 |  |  | $ | 150,804 |  |  | $ | 307,657 |  |  | $ | 499,096 |
|  | Three Months Ended |  |  | Nine Months Ended |
Disaggregated Net Sales |  | September 28, 2024 |  |  | September 30, 2023 |  |  | September 28, 2024 |  |  | September 30, 2023 |
United States |  | $ | 16,512 |  |  | $ | 23,604 |  |  | $ | 48,327 |  |  | $ | 58,097 |
China |  |  | 12,770 |  |  |  | 19,689 |  |  |  | 43,586 |  |  |  | 69,193 |
Malaysia |  |  | 12,223 |  |  |  | 23,550 |  |  |  | 42,913 |  |  |  | 78,703 |
Singapore |  |  | 9,051 |  |  |  | 13,693 |  |  |  | 34,044 |  |  |  | 38,387 |
Philippines |  |  | 10,451 |  |  |  | 19,983 |  |  |  | 32,001 |  |  |  | 77,132 |
Rest of the World |  |  | 34,335 |  |  |  | 50,285 |  |  |  | 106,786 |  |  |  | 177,584 |
Total net sales |  | $ | 95,342 |  |  | $ | 150,804 |  |  | $ | 307,657 |  |  | $ | 499,096 |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 28, |  |  | September 30, |  |  | September 28, |  |  | September 30, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Customers individually accounting for more than 10% of net sales |  |  | one |  |  |  | two |  |  |  | * |  |  |  | one |
Percentage of net sales |  |  | 12% |  |  |  | 22% |  |  |  | * |  |  |  | 13% |

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