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Contract Assets and Contract Liabilities (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Costs and estimated earnings on uncompleted contracts    
Costs incurred on uncompleted contracts $ 631,790 $ 513,558
Estimated earnings to date on uncompleted contracts 149,717 127,032
Gross contract assets 781,507 640,590
Less: billings to date (3,491,007) (703,532)
Net contract liabilities, on uncompleted contracts $ (2,709,500) $ (62,942)