Quarterly report pursuant to Section 13 or 15(d)

Contract Assets and Contract Liabilities (Details 1)

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Contract Assets and Contract Liabilities (Details 1) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Costs and estimated earnings amounts on uncompleted contracts included in balance sheets    
Costs and estimated earnings in excess of billings on uncompleted contracts $ 12,424 $ 260,325
Billings in excess of costs and estimated earnings on uncompleted contracts (1,580,481) (1,334,887)
Net contract assets (liabilities) $ (1,568,057) $ (1,074,562)