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Costs and Estimated Earnings on Uncompleted Contracts (Details) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
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Costs and estimated earnings on uncompleted contracts |  |
Costs incurred on uncompleted contracts | $ 177,529 | $ 424,477
Provision for loss on uncompleted contracts | (6,680) |
Estimated earnings | 19,516 | 41
Cost on uncompleted contracts, net | 190,365 | 424,518
Less: billings to date | (223,678) | (358,064)
Cost in excess of billing on uncompleted contracts, net | $ (33,313) | $ 66,454

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