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