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REVENUE (Schedule of Contract Liabilities on Uncompleted Contracts) (Details) - USD ($) | Jun. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
REVENUES: |  |  |
Billings and/or cash receipts on uncompleted contracts | $ 3,283 | $ 35,665 | $ 8,563,241
Less: costs and estimated earnings recognized |  | (27,004) |
Contract Liabilities | $ 3,283 | $ 8,661 | $ 2,248,829

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