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Note 9 - Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 28, 2020
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended |
|  | March 28, |  |  | March 30, |
(In thousands) |  | 2020 |  |  | 2019 |
Cost of revenue |  | $ | 591 |  |  | $ | 202 |
Research and development |  |  | 2,594 |  |  |  | 1,125 |
Selling, general, and administrative |  |  | 5,543 |  |  |  | 2,359 |
Total stock-based compensation |  | $ | 8,728 |  |  | $ | 3,686 |
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 |  |  | 91 |
Vested |  |  | (182 | )
Balance, March 28, 2020 |  |  | 1,421 |

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- Definition Tabular disclosure of number and weighted-average grant date fair value for nonvested performance shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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