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Costs and Estimated Earnings on Uncompleted Contracts (Details) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Costs and estimated earnings on uncompleted contracts
Costs incurred on uncompleted contracts	$ 21,187	$ 18,363
Provision for loss on uncompleted contracts
Estimated income	7,872	6,786
Cost on uncompleted contracts, net	29,059	25,149
Less: billings to date	(58,975)	(53,173)
Cost in excess of billing on uncompleted contracts, net	$ (29,916)	$ (28,024)

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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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