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REVENUE (Schedule of Contract Assets on Uncompleted Contracts) (Details) - USD ($) | Jun. 30, 2020 | Dec. 31, 2019
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REVENUES: |  |
Costs and estimated earnings recognized | $ 3,663,654 | $ 3,700,124
Less: Billings or cash received | (2,817,844) | (2,324,204)
Contract assets | $ 845,810 | $ 1,375,920

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