Note 8 - Stock-based Compensation (Tables)

6 Months Ended

Jul. 04, 2021

Notes Tables

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

	Three Months Ended				Six Months Ended
	July 4,		June 28,		July 4,		June 28,
	2021		2020		2021		2020
Cost of revenue	$	18	$	31	$	54	$	43
Research and development		82		486		239		22
Selling, general and administrative		102		224		277		278
Total	$	202	$	741	$	570	$	343

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

	Shares Available for Grants
Balance at January 3, 2021		320
Authorized shares		600
RSUs granted		(30	)
Options cancelled		11
RSUs forfeited or expired		19
PRSUs forfeited or expired		239
Balance at July 4, 2021		1,159

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		(11	)	$	19.59
Balance outstanding at July 4, 2021		110		$	29.31		3.16	$	—
Exercisable at July 4, 2021		110		$	29.31		3.16	$	—
Vested and expected to vest at July 4, 2021		110		$	29.31		3.16	$	—

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		30			5.11
Vested		(458	)		4.88
Forfeited		(258	)		4.98
Nonvested at July 4, 2021		114		$	5.46