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Contract Assets and Contract Liabilities (Details) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
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Schedule of costs and estimated earnings on uncompleted contracts |  |
Costs incurred on uncompleted contracts | $ 11,636,297 | $ 11,307,975
Estimated earnings to date on uncompleted contracts | 1,299,731 | 838,615
Gross contract assets | 12,936,028 | 12,146,590
Less: billings to date | (13,099,656) | (13,221,152)
Net contract assets (liabilities) | $ (163,628) | $ (1,074,562)

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