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Summary of Significant Accounting Policies (Details 2) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Summary of Significant Accounting Policies [Abstract]
Contract assets, current (costs and estimated earnings in excess of billings on uncompleted contracts)	$ 1,412	$ 61,175
Contract liabilities, current (billings in excess of costs and estimated earnings on uncompleted contracts)	(1,163,202)	(1,673,048)
Net contract liabilities	$ (1,161,790)	$ (1,611,873)

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