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Inventory (Details) (USD $)	9 Months Ended
Inventory (Details) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Inventory Disclosure [Abstract]
Allowance for inventory obsolescence	$ 258,000		$ 211,000
Raw materials	22,705,000		19,654,000
Work in process	4,840,000		6,855,000
Inventory, net	27,545,000		26,509,000
Write-offs of obsolete inventory against allowance	$ 0	$ 0

Amount of valuation reserve for inventory.

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- Definition

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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