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Note 9 - Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 26, 2020
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 26, |  |  | September 28, |  |  | September 26, |  |  | September 28, |
(In thousands) |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Cost of revenue |  | $ | 834 |  |  | $ | 453 |  |  | $ | 2,322 |  |  | $ | 982 |
Research and development |  |  | 2,633 |  |  |  | 1,658 |  |  |  | 7,461 |  |  |  | 4,029 |
Selling, general, and administrative |  |  | 7,021 |  |  |  | 3,569 |  |  |  | 20,445 |  |  |  | 8,324 |
Total stock-based compensation |  | $ | 10,488 |  |  | $ | 5,680 |  |  | $ | 30,228 |  |  | $ | 13,335 |
Share-based Payment Arrangement, Performance Shares, Activity [Table Text Block] |
(Shares in thousands) |  | Total |
Balance, December 28, 2019 |  |  | 1,163 |
Granted |  |  | 349 |
Effect of vesting multiplier |  |  | 440 |
Vested |  |  | (816 | )
Cancelled |  |  | (14 | )
Balance, September 26, 2020 |  |  | 1,122 |

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