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Note 9 - Stock-based Compensation (Tables)
6 Months Ended
Jun. 27, 2020
Notes Tables  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended

  

Six Months Ended

 
  

June 27,

  

June 29,

  

June 27,

  

June 29,

 

(In thousands)

 

2020

  

2019

  

2020

  

2019

 

Cost of revenue

 $897  $327  $1,488  $529 

Research and development

  2,234   1,246   4,828   2,371 

Selling, general, and administrative

  7,881   2,396   13,424   4,755 

Total stock-based compensation

 $11,012  $3,969  $19,740  $7,655 
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

  128 

Vested

  (246)

Balance, June 27, 2020

  1,394