Quarterly report pursuant to Section 13 or 15(d)

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

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REVENUE (Schedule of Contract Assets on Uncompleted Contracts) (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
REVENUES:    
Costs and estimated earnings recognized $ 1,679,930 $ 4,152,850
Less: Billings or cash received (1,642,364) (4,050,392)
Contract assets $ 37,566 $ 102,458