Note 8 - Stock-based Compensation (Tables)

9 Months Ended

Oct. 03, 2021

Notes Tables

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

	Three Months Ended				Nine Months Ended
	October 3,		September 27,		October 3,		September 27,
	2021		2020		2021		2020
Cost of revenue	$	78	$	37	$	132	$	80
Research and development		282		51		521		73
Selling, general and administrative		525		170		802		448
Total	$	885	$	258	$	1,455	$	601

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

	Shares Available for Grants
Balance at January 3, 2021		320
Authorized shares		600
RSUs granted		(377	)
PRSU's granted		(175	)
Options cancelled		13
RSUs forfeited or expired		23
PRSUs forfeited or expired		239
Balance at October 3, 2021		643

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

				Weighted		Weighted
				Average		Average		Aggregate
	Number of			Exercise		Remaining		Intrinsic
	Shares			Price		Term		Value
	(in thousands)					(in years)		(in thousands)
Balance outstanding at January 3, 2021		121		$	28.46		3.75		—
Forfeited or expired		(13	)	$	23.84
Balance outstanding at October 3, 2021		108		$	29.04		2.99	$	—
Exercisable at October 3, 2021		108		$	29.04		2.99	$	—
Vested and expected to vest at October 3, 2021		108		$	29.04		2.99	$	—

Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]

	RSUs & PRSUs Outstanding
				Weighted
				Average
	Number of			Grant Date
	Shares			Fair Value
	(in thousands)
Nonvested at January 3, 2021		800		$	4.99
Granted		552			5.82
Vested		(537	)		5.00
Forfeited		(262	)		4.99
Nonvested at October 3, 2021		553		$	5.81