Costs and Estimated Earnings on Uncompleted Contracts (Details 1) - USD ($)	Mar. 31, 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	$ 24,266	$ 33,349
Billings in excess of cost and estimated earnings on uncompleted contracts	(37,823)	(48,478)
Cost in excess of billing on uncompleted contracts, net	$ (13,557)	$ (15,129)