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Costs and Estimated Earnings on Uncompleted Contracts (Details 1) - USD ($)
Jun. 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 $ 131,392 $ 61,175
Billings in excess of cost and estimated earnings on uncompleted contracts (825,468) (1,673,048)
Net contract assets (liabilities) $ (694,076) $ (1,611,873)