Costs and Estimated Earnings on Uncompleted Contracts (Details 1) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Costs and estimated earnings amounts on uncompleted contracts included in balance sheets
Costs and estimated earnings in excess of billings on uncompleted contracts	$ 258,149	$ 33,349
Billings in excess of cost and estimated earnings on uncompleted contracts	(439,191)	(48,478)
Costs and estimated earnings on uncompleted contracts, net	$ (181,042)	$ (15,129)