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LIQUIDITY (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
LIQUIDITY [Abstract] |  |  |  |  |  |  |  |
Net income | $ 1,465,889 | $ 2,147,049 | $ 1,949,791 | $ (44,169) | $ 3,612,938 | $ 1,905,622 | $ 2,470,882 | $ 1,580,887
Net cash used in operations |  |  |  |  | 3,152,753 | $ 2,711,334 | 4,019,560 | 345,287
Working capital deficit | 4,991,582 |  |  |  | 4,991,582 |  | 607,372 |
Accumulated deficit | $ 36,353,653 |  |  |  | 36,353,653 |  | 32,740,715 | $ 30,269,833
Working capital increase from warrant executions |  |  |  |  |  |  | 2,300,000 |
Short-term loans |  |  |  |  |  |  | 1,330,000 |
Short-term loans, repaid |  |  |  |  |  |  | 330,000 |
Payment of banking fees and expenses |  |  |  |  |  |  | $ 8,200,000 |
Proceeds from an underwritten offering |  |  |  |  | $ 8,100,000 |  |  |

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