Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Income Taxes

Schedule of Provision for Income Taxes

	Year ended December 31,
	2020		2019		2018
Current — Federal	$	3,166	$	3,508	$	6,405
— State		904		1,090		2,001
		4,070		4,598		8,406
Deferred — Federal		2,111		1,660		(626	)
— State		171		149		1
		2,282		1,809		(625	)
Provision for Income Taxes	$	6,352	$	6,407	$	7,781

Schedule of Deferred Tax Liabilities

	2020			2019
Deferred tax liabilities (assets):
Property, plant and equipment	$	11,532		$	9,697
Patents and goodwill		1,775			1,756
Benefit plans		(1,976	)		(2,131	)
Inventories		(420	)		(350	)
Capital loss carryover		(544	)		(556	)
Other		(179	)		(513	)
		10,188			7,903
Plus: Valuation allowance		580			593
Total deferred tax liabilities	$	10,768		$	8,496

Schedule of Statutory Federal Income Tax Rate

	Year ended December 31,
	2020			2019			2018
Income tax expense at the statutory federal income tax rate	$	8,078		$	9,065		$	8,828
Increase (decrease) resulting from:
State income taxes		838			978			1,572
R&D tax credits		(1,589	)		(1,470	)		(1,212	)
Foreign-derived intangible income deduction		(1,051	)		(1,700	)		(1,000	)
Excess tax benefit from stock compensation		(81	)		(412	)		(95	)
Change in valuation allowance		(13	)		(16	)		-
Uncertain tax positions		(450	)		(42	)		(373	)
Other, net		619			4			61
Provision for Income Taxes	$	6,352		$	6,407		$	7,781

Schedule of Deferred Tax Valuation Allowance

Gross unrecognized tax benefits at January 1, 2018	$	865
Increase in tax positions for prior years		25
Increase in tax positions for current years		—
Lapse in statutes of limitation		(397	)
Gross unrecognized tax benefits at December 31, 2018	$	493
Increase in tax positions for prior years		19
Increase in tax positions for current year		—
Lapse in statutes of limitation		(62	)
Gross unrecognized tax benefits at December 31, 2019	$	450
Increase in tax positions for prior years		8
Increase in tax positions for current year		—
Lapse in statutes of limitation		(458	)
Gross unrecognized tax benefits at December 31, 2020	$	—