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Inventories, Net - Inventories, Net (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Inventory [Line Items]
Total raw materials	$ 3,650	$ 3,220
Total work-in-process	11,504	11,668
Total finished goods	2,999	3,449
Total inventories, net	18,153	18,337
Security Products
Inventory [Line Items]
Total raw materials	2,744	2,318
Total work-in-process	9,066	9,214
Total finished goods	2,086	2,235
Marine Components
Inventory [Line Items]
Total raw materials	906	902
Total work-in-process	2,438	2,454
Total finished goods	$ 913	$ 1,214

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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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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