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Costs and Estimated Earnings on Uncompleted Contracts (Details) (USD $) | Jun. 30, 2013 | Dec. 31, 2012
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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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