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Inventories - Inventories, net (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Inventories [Line Items]
Total raw materials	$ 3,926	$ 3,253
Total work-in-process	6,295	5,902
Total finished goods	2,036	2,068
Total inventories, net	12,257	11,223
Security Products [Member]
Inventories [Line Items]
Total raw materials	2,720	2,310
Total work-in-process	5,783	5,458
Total finished goods	1,597	1,578
Marine Components [Member]
Inventories [Line Items]
Total raw materials	1,206	943
Total work-in-process	512	444
Total finished goods	$ 439	$ 490

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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