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Contract Assets and Contract Liabilities (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Costs and estimated earnings on uncompleted contracts    
Costs incurred on uncompleted contracts $ 4,572,581 $ 513,558
Estimated earnings to date on uncompleted contracts 872,302 127,032
Gross contract assets 5,444,883 640,590
Less: billings to date (5,916,487) (703,532)
Net contract assets (liabilities) $ (471,604) $ (62,942)