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Note 9 - Stock-based Compensation (Tables)
6 Months Ended
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