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Business and Geographic Segments - Business Segment Information by Geographical Areas (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Net sales	$ 24,700us-gaap_SalesRevenueNet	$ 26,500us-gaap_SalesRevenueNet	$ 26,800us-gaap_SalesRevenueNet	$ 25,800us-gaap_SalesRevenueNet	$ 22,300us-gaap_SalesRevenueNet	$ 24,200us-gaap_SalesRevenueNet	$ 24,000us-gaap_SalesRevenueNet	$ 21,500us-gaap_SalesRevenueNet	$ 103,846us-gaap_SalesRevenueNet	$ 92,045us-gaap_SalesRevenueNet	$ 83,196us-gaap_SalesRevenueNet
Total assets	131,535us-gaap_Assets				121,678us-gaap_Assets				131,535us-gaap_Assets	121,678us-gaap_Assets	150,183us-gaap_Assets
Operating Segments \| Security Products
Segment Reporting Information [Line Items]
Net sales									91,470	81,510	73,715
Total assets	72,111				69,918				72,111	69,918	69,143
Operating Segments \| Marine Components
Segment Reporting Information [Line Items]
Net sales									12,376	10,535	9,481
Total assets	9,951				9,782				9,951	9,782	9,689
Corporate and eliminations
Segment Reporting Information [Line Items]
Total assets	49,473				41,978				49,473	41,978	71,351
Point Of Destination \| United States
Segment Reporting Information [Line Items]
Net sales									98,994	87,307	78,268
Point Of Destination \| Canada
Segment Reporting Information [Line Items]
Net sales									1,927	2,195	2,194
Point Of Destination \| Mexico
Segment Reporting Information [Line Items]
Net sales									1,124	1,129	1,249
Point Of Destination \| Other
Segment Reporting Information [Line Items]
Net sales									$ 1,801	$ 1,414	$ 1,485