XML 43 R33.htm IDEA: XBRL DOCUMENT v3.8.0.1
Costs and Estimated Earnings on Uncompleted Contracts (Details 1) - USD ($)
Mar. 31, 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 $ 1,412 $ 61,175
Billings in excess of cost and estimated earnings on uncompleted contracts (1,163,202) (1,673,048)
Net contract liabilities $ (1,161,790) $ (1,611,873)