Note 6 - Employee Benefit Plans (Tables)

12 Months Ended

Dec. 30, 2023

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

(in thousands)	2023			2022			2021
Service cost	$	551		$	954		$	1,223
Interest cost		510			56			61
Expected return on assets		(331	)		(128	)		(128	)
Settlements		(177	)		(487	)		72
Net periodic costs	$	553		$	395		$	1,228

Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block]

(in thousands)	2023			2022
Change in projected benefit obligation:
Benefit obligation at beginning of year	$	(21,628	)	$	(28,765	)
Service cost		(551	)		(954	)
Interest cost		(510	)		(56	)
Actuarial gain (loss)		(1,391	)		6,043
Participant contributions		(1,153	)		(1,459	)
Benefits paid		385			378
Plan change		-			397
Settlements		2,177			2,426
Foreign currency exchange adjustment		(2,213	)		362
Benefit obligation at end of year		(24,884	)		(21,628	)
Change in plan assets:
Fair value of plan assets at beginning of year		18,411			18,919
Return on assets, net of actuarial loss		52			119
Employer contributions		860			831
Participant contributions		1,153			1,459
Benefits paid		(385	)		(378	)
Settlements		(2,177	)		(2,426	)
Foreign currency exchange adjustment		1,786			(113	)
Fair value of plan assets at end of year		19,700			18,411
Net liability at end of year	$	(5,184	)	$	(3,217	)

Defined Benefit Plan, Assumptions [Table Text Block]

	2023			2022
Discount rate		1.5	%		2.3	%
Compensation increase		2.0	%		3.0	%

	2023			2022			2021
Discount rate		1.5	%		2.3	%		0.2	%
Rate of return on assets		1.5	%		1.8	%		0.7	%
Compensation increase		2.0	%		3.0	%		1.1	%

Schedule of Net Funded Status [Table Text Block]

(in thousands)	2023			2022
Accumulated benefit obligation at beginning of year	$	(1,657	)	$	(2,097	)
Interest cost		(78	)		(51	)
Actuarial (gain) loss		(6	)		382
Benefits paid		90			109
Accumulated benefit obligation at end of year		(1,651	)		(1,657	)
Plan assets at end of year		-			-
Funded status	$	(1,651	)	$	(1,657	)

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

	2022					2021
				Wt. Avg.					Wt. Avg.
(in thousands, except per share data)	Shares			Ex. Price		Shares			Ex. Price
Outstanding and exercisable, beginning of year		12		$	9.44		262		$	10.01
Exercised		(12	)	$	9.44		(250	)	$	10.03
Outstanding and exercisable, end of year		-		$	-		12		$	9.44

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

	2023					2022					2021
				Wt. Avg.					Wt. Avg.					Wt. Avg.
(in thousands, except per share data)	Units			Fair Value		Units			Fair Value		Units			Fair Value
Outstanding, beginning of year		969		$	24.55		1,058		$	21.16		1,414		$	15.16
Granted		365		$	36.66		431		$	27.74		270		$	41.66
Released		(428	)	$	22.33		(474	)	$	19.94		(579	)	$	16.23
Cancelled		(22	)	$	28.62		(46	)	$	24.33		(47	)	$	18.96
Outstanding, end of year		884		$	30.52		969		$	24.55		1,058		$	21.16

Schedule of Nonvested Performance-Based Units Activity [Table Text Block]

	2023					2022					2021
				Wt. Avg.					Wt. Avg.					Wt. Avg.
(in thousands, except per share data)	Units			Fair Value		Units			Fair Value		Units			Fair Value
Outstanding, beginning of year		403		$	28.64		384		$	22.22		425		$	15.51
Granted		270		$	39.97		151		$	33.22		93		$	51.43
Released		(258	)	$	13.18		(55	)	$	14.11		(125	)	$	21.77
Cancelled		(7	)	$	42.52		(77	)	$	15.94		(9	)	$	14.04
Outstanding, end of year		408		$	45.65		403		$	28.64		384		$	22.22

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

Employee Stock Purchase Plan	2023			2022			2021
Dividend yield		0.0	%		0.0	%		0.0	%
Expected volatility		36.3	%		45.6	%		58.3	%
Risk-free interest rate		4.5	%		1.2	%		0.1	%
Expected term (years)		0.5			0.5			0.5
Weighted-average grant date fair
value per share	$	8.54		$	8.79		$	9.42

Restricted Stock Units	2023			2022			2021
Dividend yield		0.0	%		0.0	%		0.0	%

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

(in thousands)	2023			2022			2021
Cost of sales	$	845		$	646		$	828
Research and development		3,394			3,100			3,017
Selling, general and administrative		12,998			11,172			9,947
Share-based compensation of continuing operations		17,237			14,918			13,792
Income tax benefit		(1,770	)		(4,004	)		(722	)
Total share-based compensation, net of tax	$	15,467		$	10,914		$	13,070