Quarterly report pursuant to Section 13 or 15(d)

REVENUE (Schedule of Contract Liabilities on Uncompleted Contracts) (Details)

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REVENUE (Schedule of Contract Liabilities on Uncompleted Contracts) (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Revenue    
Billings and/or cash receipts on uncompleted contracts $ 2,559,222 $ 2,978,007
Less: Costs and estimated earnings recognized (2,387,941) (2,268,454)
Contract liabilities $ 171,281 $ 709,553