Note 13 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 29, 2024

Notes Tables

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

	Fiscal Years
Stock-based compensation expense included in:		2024		2023		2022
Cost of revenue	$	852	$	328	$	272
Research and development		1,048		595		652
Selling, general and administrative		2,706		1,599		1,111
Total costs and expenses	$	4,606	$	2,522	$	2,035

	Fiscal Years
Stock-based compensation expense by type of award:	2024		2023		2022
ESPP	$	108	$	127	$	70
RSU and PRSU		4,498		2,395		1,965
Total costs and expenses	$	4,606	$	2,522	$	2,035

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

	Shares Available for Grant
Balance at January 1, 2023		960
RSUs and PRSUs granted		(400	)
Options forfeited or expired		15
RSUs and PRSUs forfeited		20
Balance at December 31, 2023		595
Options forfeited or expired		12
RSUs and PRSUs granted		(635	)
RSUs and PRSUs forfeited		93
Balance at December 29, 2024		65

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

	Number of Shares			Weighted Average Exercise Price		Weighted Average Remaining Term		Aggregate Intrinsic Value
	(in thousands)					(in years)		(in thousands)
Balance outstanding at January 3, 2021		121		$	28.46
Forfeited or expired		(28	)		31.68
Balance outstanding at January 2, 2022		93			27.49
Forfeited or expired		(18	)		39.72
Balance outstanding at January 1, 2023		75			24.50
Forfeited or expired		(15	)		45.22
Balance outstanding at December 31, 2023		60			19.45
Forfeited or expired		(12	)		48.14
Outstanding, exercisable, and vested at December 29, 2024		48		$	12.05		1.70	$	—

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

	RSUs Outstanding
	Number of Shares			Weighted Average Grant Date Fair Value
	(in thousands)
Nonvested at January 2, 2022		568		$	5.86
Granted		584			6.11
Vested		(490	)		5.56
Forfeited		(32	)		5.35
Nonvested at January 1, 2023		630			6.05
Granted		400			8.12
Vested		(421	)		6.15
Forfeited		(20	)		6.92
Nonvested at December 31, 2023		589			7.35
Granted		635			9.57
Vested		(532	)		8.29
Forfeited		(93	)		13.16
Nonvested at December 29, 2024		599		$	7.97

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

	Fiscal Years
	2024			2023			2022
Expected life (months)		5.9			6.0			6.0
Risk-free interest rate		4.71	%		5.30	%		3.04	%
Volatility		64	%		50	%		57	%
Dividend yield		—			—			—
Weighted average fair value of ESPP options granted	$	2.93		$	2.14		$	2.04