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Contract Assets and Contract Liabilities (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
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)