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Costs and Estimated Earnings on Uncompleted Contracts (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Costs and estimated earnings on uncompleted contracts
Costs incurred on uncompleted contracts	$ 9,183,162	$ 3,681,965
Estimated earnings to date on uncompleted contracts	719,589	328,273
Gross contract assets	9,902,751	4,010,238
Less: billings to date	(11,876,802)	(5,622,111)
Net contract assets (liabilities)	$ (1,974,051)	$ (1,611,873)

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