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