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Note 9 - Stock-based Compensation (Tables) | 6 Months Ended
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Jul. 03, 2021
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | July 3, |  |  | June 27, |  |  | July 3, |  |  | June 27, |
(In thousands) |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Cost of revenue |  | $ | 825 |  |  | $ | 897 |  |  | $ | 1,491 |  |  | $ | 1,488 |
Research and development |  |  | 3,969 |  |  |  | 2,234 |  |  |  | 6,736 |  |  |  | 4,828 |
Selling, general, and administrative |  |  | 7,126 |  |  |  | 7,881 |  |  |  | 14,147 |  |  |  | 13,424 |
Total stock-based compensation |  | $ | 11,920 |  |  | $ | 11,012 |  |  | $ | 22,374 |  |  | $ | 19,740 |
Share-based Payment Arrangement, Performance Shares, Outstanding Activity [Table Text Block] |
(Shares in thousands) |  | Total |
Balance, January 2, 2021 |  |  | 1,021 |
Granted |  |  | 607 |
Effect of vesting multiplier |  |  | 55 |
Vested |  |  | (110 | )
Balance, July 3, 2021 |  |  | 1,573 |

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