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Costs and Estimated Earnings on Uncompleted Contracts (Details) (USD $) | Mar. 31, 2013 | Dec. 31, 2012
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Summary of costs and estimated earnings on uncompleted contracts |  |
Costs incurred on uncompleted contracts | $ 317,022 | $ 177,529
Provision for loss on uncompleted contracts | (58,433) | (6,680)
Estimated earnings | 72,710 | 19,516
Cost on uncompleted contracts, net | 331,299 | 190,365
Less: billings to date | (316,552) | (223,678)
Cost in excess of billing on uncompleted contracts, net | $ 14,747 | $ (33,313)

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