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Note 13 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

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

		Fiscal Years
Stock-based compensation expense included in:			2023				2022				2021
Cost of revenue		$	328			$	272			$	282
Research and development			595				652				843
Selling, general and administrative			1,599				1,111				1,401
Total costs and expenses		$	2,522			$	2,035			$	2,526

		Fiscal Years
Stock-based compensation expense by type of award:		2023				2022				2021
ESPP		$	127.00			$	70.00			$	110.00
RSU and PRSU			2,395				1,965				2,416
Total costs and expenses		$	2,522			$	2,035			$	2,526

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

		Shares Available for Grant
Balance at January 2, 2022			594
Authorized			900
RSUs granted			(584	)
Options forfeited or expired			18
RSUs forfeited			32
Balance at January 1, 2023			960
Options forfeited or expired			15
RSUs granted			(400	)
RSUs forfeited			20
Balance at December 31, 2023			595

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 December 29, 2019			186			$	32.09
Forfeited or expired			(65	)			38.83
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
Outstanding, exercisable, and vested at December 31, 2023			60			$	19.45				2.27			$	86

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 3, 2021			800			$	4.99
Granted			619				5.81
Vested			(586	)			4.99
Forfeited			(265	)			5.00
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

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

		Fiscal Years
		2023				2022				2021
Expected life (months)			6.0				6.0				6.0
Risk-free interest rate			5.30	%			3.04	%			0.05	%
Volatility			50	%			57	%			74	%
Dividend yield			—				—				—
Weighted average fair value of ESPP options granted		$	2.14			$	2.04			$	2.18

X

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