Note 6 - Employee Benefit Plans (Tables)

12 Months Ended

Dec. 26, 2020

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

(in thousands)	2020			2019			2018
Service cost	$	1,310		$	920		$	925
Interest cost		67			267			207
Expected return on assets		(200	)		(168	)		(124	)
Settlements		292			-			-
Net periodic costs	$	1,469		$	1,019		$	1,008

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

(in thousands)	2020			2019
Change in projected benefit obligation:
Benefit obligation at beginning of year	$	(32,241	)	$	(29,910	)
Service cost		(1,310	)		(920	)
Interest cost		(67	)		(267	)
Actuarial gain (loss)		1,916			(1,456	)
Participant contributions		(1,136	)		(1,434	)
Benefits paid		419			2,313
Plan change		944			-
Settlements		3,446			-
Foreign currency exchange adjustment		(3,010	)		(567	)
Benefit obligation at end of year		(31,039	)		(32,241	)
Change in plan assets:
Fair value of plan assets at beginning of year		18,705			18,088
Return on assets, net of actuarial loss		129			281
Employer contributions		886			882
Participant contributions		1,136			1,434
Benefits paid		(419	)		(2,313	)
Settlements		(3,446	)		-
Foreign currency exchange adjustment		1,765			333
Fair value of plan assets at end of year		18,756			18,705
Net liability at end of year	$	(12,283	)	$	(13,536	)

Defined Benefit Plan, Assumptions [Table Text Block]

	2020		2019
Discount rate		0.2%		0.2%
Compensation increase		1.1%		1.1%

	2020		2019		2018
Discount rate		0.2%		0.9%		0.7%
Rate of return on assets		1.0%		0.9%		0.7%
Compensation increase		1.1%		1.8%		1.8%

Schedule of Net Funded Status [Table Text Block]

(in thousands)	2020			2019
Accumulated benefit obligation at beginning of year	$	(2,571	)	$	(2,880	)
Interest cost		(75	)		(115	)
Actuarial gain		134			258
Benefits paid		114			166
Accumulated benefit obligation at end of year		(2,398	)		(2,571	)
Plan assets at end of year		-			-
Funded status	$	(2,398	)	$	(2,571	)

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

	2020					2019					2018
				Wt. Avg.					Wt. Avg.					Wt. Avg.
(in thousands, except per share data)	Shares			Ex. Price		Shares			Ex. Price		Shares			Ex. Price
Outstanding, beginning of year		363		$	10.27		405		$	10.22		472		$	10.20
Exercised		(101	)	$	10.95		(42	)	$	9.82		(67	)	$	10.10
Outstanding, end of year		262		$	10.01		363		$	10.27		405		$	10.22
Options exercisable at year end		262		$	10.01		363		$	10.27		405		$	10.22

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

			Options Outstanding						Options Exercisable
					Approximate
					Wt. Avg.
Range of			Number		Remaining		Wt. Avg.		Number		Wt. Avg.
Exercise Prices			Outstanding		Life (Years)		Ex. Price		Exercisable		Ex. Price
$ 9.44	-	$ 10.54		159		2.2	$	9.50		159	$	9.50
$ 10.55	-	$ 10.58		92		1.2	$	10.58		92	$	10.58
$ 10.59	-	$ 12.58		11		3.5	$	12.44		11	$	12.44
				262		1.9	$	10.01		262	$	10.01

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

	2020					2019					2018
				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		1,328		$	17.05		1,265		$	19.48		981		$	12.50
Granted		779		$	14.02		694		$	14.32		822		$	23.70
Released		(621	)	$	17.48		(563	)	$	19.08		(500	)	$	13.10
Cancelled		(72	)	$	17.59		(68	)	$	17.60		(38	)	$	14.67
Outstanding, end of year		1,414		$	15.16		1,328		$	17.05		1,265		$	19.48

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

	2020					2019					2018
				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		364		$	18.72		340		$	17.89		334		$	14.31
Granted		200		$	13.18		167		$	14.11		89		$	24.32
Released		(39	)	$	21.40		(36	)	$	11.35		(41	)	$	9.92
Cancelled		(100	)	$	20.25		(107	)	$	11.35		(42	)	$	10.69
Outstanding, end of year		425		$	15.51		364		$	18.72		340		$	17.89

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

Employee Stock Purchase Plan	2020			2019			2018
Dividend yield		0.5	%		1.3	%		1.1	%
Expected volatility		67.1	%		46.4	%		39.0	%
Risk-free interest rate		1.1	%		2.2	%		1.7	%
Expected term (years)		0.5			0.5			0.5
Weighted-average grant date fair value per share	$	6.01		$	5.35		$	5.90

Restricted Stock Units	2020			2019			2018
Dividend yield		0.0	%		1.6	%		1.0	%

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

(in thousands)	2020			2019			2018
Cost of sales	$	893		$	736		$	546
Research and development		3,245			2,994			1,717
Selling, general and administrative		10,096			10,418			7,790
Share-based compensation of continuing operations		14,234			14,148			10,053
Income tax benefit		(963	)		(587	)		(993	)
Total share-based compensation, net of tax	$	13,271		$	13,561		$	9,060