Quarterly report pursuant to Section 13 or 15(d)

Uncompleted Contracts - Schedule of Uncompleted Contracts (Details)

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Uncompleted Contracts - Schedule of Uncompleted Contracts (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Contractors [Abstract]    
Revenue recognized $ 102,700
Less: billings to date (95,900)
Costs and estimated earnings in excess of billings on uncompleted contracts 6,800 [1]
Billings to date 2,169,900 1,716,800
Revenue recognized (1,761,400) (1,392,900)
Revenue contract liabilities $ 408,500 $ 323,900 [1]
[1] These numbers were derived from the audited financial statements for the year ended December 31, 2020.