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Contract Assets and Contract Liabilities (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Costs and estimated earnings on uncompleted contracts |  |
Costs incurred on uncompleted contracts | $ 11,307,975 | $ 3,681,965
Estimated earnings to date on uncompleted contracts | 838,615 | 328,273
Gross contract assets | 12,146,590 | 4,010,238
Less: billings to date | (13,221,152) | (5,622,111)
Net contract assets (liabilities) | $ (1,074,562) | $ (1,611,873)

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