Annual report pursuant to Section 13 and 15(d)

Uncompleted Contracts - Schedule of Uncompleted Contracts (Details)

v3.21.1
Uncompleted Contracts - Schedule of Uncompleted Contracts (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Contractors [Abstract]    
Revenue recognized $ 102,700 $ 1,074,800
Less: billings to date (95,900) (832,300)
Costs and estimated earnings in excess of billings on uncompleted contracts 6,800 242,500
Billings to date 1,716,800 2,707,200
Revenue recognized (1,392,900) (2,380,100)
Revenue contract liabilities $ 323,900 $ 327,100