Note 11 - Stock-Based Compensation Plans (Tables)

12 Months Ended

Jan. 01, 2022

Notes Tables

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

	Year Ended
	January 1,		January 2,		December 28,
(In thousands)	2022		2021		2019
Cost of revenue	$	3,049	$	3,179	$	1,422
Research and development		14,563		10,124		5,640
Selling, general, and administrative		28,863		27,069		11,837
Total stock-based compensation	$	46,475	$	40,372	$	18,899

Schedule of Share-based Payment Award, Stock Options and Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]

	Year Ended
	January 1,	January 2,	December 28,
	2022	2021	2019
Employee Stock Purchase Plan
Weighted average expected volatility	39.9%	48.2%	31.6%
Weighted average risk-free interest rate	0.07%	0.89%	2.51%
Expected term (in months)	6	6	6

Share-based Payment Arrangement, Option, Activity [Table Text Block]

(Shares and aggregate intrinsic value in thousands)	Shares			Weighted average exercise price		Weighted average remaining contractual term (years)		Aggregate Intrinsic Value
Balance, January 2, 2021		2,200		$	6.40
Granted		—			—
Exercised		(822	)		6.02
Forfeited or expired		(11	)		5.73
Balance, January 1, 2022		1,367		$	6.62
Vested and expected to vest at January 1, 2022		1,367		$	6.62		2.92	$	96,315
Exercisable, January 1, 2022		1,367		$	6.62		2.92	$	96,315

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

(Shares in thousands)	Shares			Weighted average grant date fair value
Balance, January 2, 2021		2,998		$	16.76
Granted		1,176			56.29
Vested		(1,392	)		14.66
Forfeited or expired		(98	)		19.71
Balance, January 1, 2022		2,684		$	35.06

Schedule of Share-based Payment Award, Restricted Stock Units, Valuation Assumptions [Table Text Block]

	Year Ended
	January 1,	January 2,	December 28,
	2022	2021	2019
Executive RSUs with a market condition or performance condition
Weighted average expected volatility	50.37% to 52.11%	42.38%	40.15% to 41.10%
Weighted average risk-free interest rate	0.22% to 0.77%	1.40%	1.66% to 2.55%
Expected term (years)	3.00 to 5.00	3.00	3.00

Share-based Payment Arrangement, Performance Shares, Outstanding Activity [Table Text Block]

(Shares in thousands)	Shares			Weighted average grant date fair value
Balance, January 2, 2021		1,021		$	20.42
Granted		630			57.29
Effect of vesting multiplier		479			—
Vested		(884	)		13.87
Balance, January 1, 2022		1,246		$	41.23