Note 6 - Employee Benefit Plans (Tables)

12 Months Ended

Dec. 25, 2021

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

(in thousands)	2021			2020			2019
Service cost	$	1,223		$	1,310		$	920
Interest cost		61			67			267
Expected return on assets		(128	)		(200	)		(168	)
Settlements		72			292			-
Net periodic costs	$	1,228		$	1,469		$	1,019

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

(in thousands)	2021			2020
Change in projected benefit obligation:
Benefit obligation at beginning of year	$	(31,039	)	$	(32,241	)
Service cost		(1,223	)		(1,310	)
Interest cost		(61	)		(67	)
Actuarial gain		1,179			1,916
Participant contributions		(1,780	)		(1,136	)
Benefits paid		436			419
Plan change		1,076			944
Settlements		1,653			3,446
Foreign currency exchange adjustment		994			(3,010	)
Benefit obligation at end of year		(28,765	)		(31,039	)
Change in plan assets:
Fair value of plan assets at beginning of year		18,756			18,705
Return on assets, net of actuarial loss		207			129
Employer contributions		878			886
Participant contributions		1,780			1,136
Benefits paid		(436	)		(419	)
Settlements		(1,653	)		(3,446	)
Foreign currency exchange adjustment		(613	)		1,765
Fair value of plan assets at end of year		18,919			18,756
Net liability at end of year	$	(9,846	)	$	(12,283	)

Defined Benefit Plan, Assumptions [Table Text Block]

	2021		2020
Discount rate		0.2%		0.2%
Compensation increase		1.5%		1.1%

	2021		2020		2019
Discount rate		0.2%		0.2%		0.9%
Rate of return on assets		0.7%		1.0%		0.9%
Compensation increase		1.1%		1.1%		1.8%

Schedule of Net Funded Status [Table Text Block]

(in thousands)	2021			2020
Accumulated benefit obligation at beginning of year	$	(2,398	)	$	(2,571	)
Interest cost		(49	)		(75	)
Actuarial gain		241			134
Benefits paid		109			114
Accumulated benefit obligation at end of year		(2,097	)		(2,398	)
Plan assets at end of year		-			-
Funded status	$	(2,097	)	$	(2,398	)

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

	2021					2020					2019
(in thousands, except per share data)	Shares			Wt. Avg. Ex. Price		Shares			Wt. Avg. Ex. Price		Shares			Wt. Avg. Ex. Price
Outstanding and exercisable, beginning of year		262		$	10.01		363		$	10.27		405		$	10.22
Exercised		(250	)	$	10.03		(101	)	$	10.95		(42	)	$	9.82
Outstanding and exercisable, end of year		12		$	9.44		262		$	10.01		363		$	10.27

Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block]

		Options Outstanding						Options Exercisable
				Approximate
				Wt. Avg.
		Number		Remaining		Wt. Avg.		Number		Wt. Avg.
Exercise Price		Outstanding		Life (Years)		Ex. Price		Exercisable		Ex. Price
$	9.44		12		1.3	$	9.44		12	$	9.44

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

	2021					2020					2019
(in thousands, except per share data)	Units			Wt. Avg. Fair Value		Units			Wt. Avg. Fair Value		Units			Wt. Avg. Fair Value
Outstanding, beginning of year		1,414		$	15.16		1,328		$	17.05		1,265		$	19.48
Granted		270		$	41.66		779		$	14.02		694		$	14.32
Released		(579	)	$	16.23		(621	)	$	17.48		(563	)	$	19.08
Cancelled		(47	)	$	18.96		(72	)	$	17.59		(68	)	$	17.60
Outstanding, end of year		1,058		$	21.16		1,414		$	15.16		1,328		$	17.05

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

	2021					2020					2019
(in thousands, except per share data)	Units			Wt. Avg. Fair Value		Units			Wt. Avg. Fair Value		Units			Wt. Avg. Fair Value
Outstanding, beginning of year		425		$	15.51		364		$	18.72		340		$	17.89
Granted		93		$	51.43		200		$	13.18		167		$	14.11
Released		(125	)	$	21.77		(39	)	$	21.40		(36	)	$	11.35
Cancelled		(9	)	$	14.04		(100	)	$	20.25		(107	)	$	11.35
Outstanding, end of year		384		$	22.22		425		$	15.51		364		$	18.72

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

Employee Stock Purchase Plan	2021			2020			2019
Dividend yield		0.0	%		0.5	%		1.3	%
Expected volatility		58.3	%		67.1	%		46.4	%
Risk-free interest rate		0.1	%		1.1	%		2.2	%
Expected term (years)		0.5			0.5			0.5
Weighted-average grant date fair value per share	$	9.42		$	6.01		$	5.35

Restricted Stock Units	2021			2020			2019
Dividend yield		0.0	%		0.0	%		1.6	%

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

(in thousands)	2021			2020			2019
Cost of sales	$	828		$	893		$	736
Research and development		3,017			3,245			2,994
Selling, general and administrative		9,947			10,096			10,418
Share-based compensation of continuing operations		13,792			14,234			14,148
Income tax benefit		(722	)		(963	)		(587	)
Total share-based compensation, net of tax	$	13,070		$	13,271		$	13,561