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Costs and Estimated Earnings on Uncompleted Contracts (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Costs and estimated earnings on uncompleted contracts
Costs incurred on uncompleted contracts	$ 228,643	$ 177,529
Provision for loss on uncompleted contracts	9,896	6,680
Estimated earnings (losses)	(47,932)	6,156
Cost on uncompleted contracts, net	190,607	190,365
Less: billings to date	(214,956)	(223,678)
Cost in excess of billing on uncompleted contracts, net	$ (24,349)	$ (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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