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Contract Assets and Contract Liabilities (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
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Costs and estimated earnings on uncompleted contracts |  |
Costs incurred on uncompleted contracts | $ 8,670,563 | $ 4,572,581
Provision for loss on uncompleted contracts | 1,321,094 |
Estimated earnings (losses) to date on uncompleted contracts | (3,584,557) | 872,302
Gross contract assets | 6,407,100 | 5,444,883
Less: billings to date | (7,098,658) | (5,916,487)
Net contract assets (liabilities), on uncompleted contracts | $ (691,558) | $ (471,604)

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