Business Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net sales:
Total net sales	$ 37,598	$ 35,241	$ 73,129	$ 70,018
Operating income:
Total operating income	3,929	3,138	6,838	11,898
Business segment information
Other non-operating income, net	6	128	9	257
Interest expense	(141)	(187)	(302)	(399)
Income before income taxes	3,794	3,079	6,545	11,756
Security Products [Member]
Net sales:
Total net sales	19,248	18,396	37,442	36,185
Operating income:
Total operating income	3,669	3,788	7,141	7,361
Furniture Components [Member]
Net sales:
Total net sales	15,452	14,146	30,555	29,041
Operating income:
Total operating income	1,771	765	3,096	7,640
Marine Components [Member]
Net sales:
Total net sales	2,898	2,699	5,132	4,792
Operating income:
Total operating income	102	(57)	(148)	(412)
Corporate operating expenses [Member]
Operating income:
Total operating income	$ (1,613)	$ (1,358)	$ (3,251)	$ (2,691)