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Note 9 - Stock-based Compensation (Tables) | 3 Months Ended
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Apr. 03, 2021
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended |
|  | April 3, |  |  | March 28, |
(In thousands) |  | 2021 |  |  | 2020 |
Cost of revenue |  | $ | 666 |  |  | $ | 591 |
Research and development |  |  | 2,767 |  |  |  | 2,594 |
Selling, general, and administrative |  |  | 7,021 |  |  |  | 5,543 |
Total stock-based compensation |  | $ | 10,454 |  |  | $ | 8,728 |
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, April 3, 2021 |  |  | 1,573 |

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