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v3.21.1

Contract Assets and Contract Liabilities (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
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Costs and estimated earnings on uncompleted contracts |  |
Costs incurred on uncompleted contracts | $ 6,280,201 | $ 4,572,581
Estimated earnings to date on uncompleted contracts | (350,587) | 872,302
Gross contract assets | 5,929,614 | 5,444,883
Less: billings to date | (5,160,365) | (5,916,487)
Net contract assets (liabilities), on uncompleted contracts | $ 769,249 | $ (471,604)

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