Business Segment Information (Tables)

3 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Schedule of Business Segment Information

	Three months ended
	March 31,
	2020			2021
	(In thousands)
Net sales:
Security Products	$	25,469		$	25,885
Marine Components		6,842			10,039
Total net sales	$	32,311		$	35,924
Operating income (loss):
Security Products	$	5,713		$	5,490
Marine Components		1,082			1,943
Corporate operating expenses		(1,775	)		(1,616	)
Total operating income		5,020			5,817
Interest income		607			338
Income before income taxes	$	5,627		$	6,155