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Contract Assets and Contract Liabilities (Details) - USD ($) | Sep. 30, 2019 | Dec. 31, 2018
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Schedule of costs and estimated earnings on uncompleted contracts |  |
Costs incurred on uncompleted contracts | $ 228,461 | $ 11,307,975
Estimated earnings to date on uncompleted contracts | 79,852 | 838,615
Gross contract assets | 308,313 | 12,146,590
Less: billings to date | (540,715) | (13,221,152)
Net contract assets (liabilities) | $ (232,402) | $ (1,074,562)

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