Quarterly report pursuant to Section 13 or 15(d)

Costs and Estimated Earnings on Uncompleted Contracts (Details)

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Costs and Estimated Earnings on Uncompleted Contracts (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
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)