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Costs and Estimated Earnings on Uncompleted Contracts (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Summary of costs and estimated earnings on uncompleted contracts
Costs incurred on uncompleted contracts	$ 1,236,157	$ 177,529
Provision for loss on uncompleted contracts	(38,604)	(6,680)
Estimated earnings	(58,232)	19,516
Cost on uncompleted contracts, net	1,139,321	190,365
Less: billings to date	(1,066,689)	(223,678)
Cost in excess of billing on uncompleted contracts, net	$ 72,632	$ (33,313)

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Amount billed to customers under long-term contracts or programs but not paid. Excludes amounts due that have been withheld because of retainage provisions in a contract.

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Cumulative provision for contract losses not offset against related costs accumulated on the balance sheet.

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