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Costs and Estimated Earnings on Uncompleted Contracts (Details 1) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Costs and estimated earnings amounts on uncompleted contracts included in balance sheets    
Costs and estimated earnings in excess of billings on uncompleted contracts $ 107,689 $ 61,175
Billings in excess of costs and estimated earnings on uncompleted contracts (2,081,740) (1,673,048)
Net contract assets (liabilities) $ (1,974,051) $ (1,611,873)