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Costs and Estimated Earnings on Uncompleted Contracts (Details) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
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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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