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Costs and Estimated Earnings on Uncompleted Contracts (Details) - USD ($) | Sep. 30, 2017 | Dec. 31, 2016
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Costs and estimated earnings on uncompleted contracts |  |
Costs incurred on uncompleted contracts | $ 1,979,931 | $ 316,722
Provision for loss on uncompleted contracts |  |
Estimated earnings to date on uncompleted contracts | 135,876 | 40,488
Cost on uncompleted contracts, net | 2,115,807 | 357,210
Less: billings to date | (2,859,498) | (372,339)
Costs and estimated earnings on uncompleted contracts, net | $ (743,691) | $ (15,129)

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