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Inventories (Details) - Inventories (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Inventories [Abstract]
Raw materials	$ 1,955	$ 1,644	$ 1,826
Work-in-progress	376	393	449
Finished goods	448	431	600
Invetories, Total	$ 2,779	$ 2,468	$ 2,875

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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