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NATURE OF OPERATIONS, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($) | Jun. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Number of warrants outstanding | 1,588,750 |  |
Cash, uninsured balance | $ 4,952,107 |  |
Employee stock options | 311,898 | 154,429 | 160,143
Series B Convertible Preferred Stock [Member] |  |  |
Number of shares issued upon conversion | 243,571 |  |

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