Note 9 - Stock-based Compensation (Tables)

9 Months Ended

Oct. 02, 2021

Notes Tables

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

	Three Months Ended				Nine Months Ended
	October 2,		September 26,		October 2,		September 26,
(In thousands)	2021		2020		2021		2020
Cost of revenue	$	653	$	834	$	2,144	$	2,322
Research and development		3,463		2,633		10,199		7,461
Selling, general, and administrative		6,134		7,021		20,281		20,445
Total stock-based compensation	$	10,250	$	10,488	$	32,624	$	30,228

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		391
Vested		(744	)
Balance, October 2, 2021		1,275