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LONG-TERM DEBT (Financed Insurance Loan) (Details) - USD ($) | Jun. 30, 2020 | Dec. 31, 2019 | Jul. 31, 2019 | Jul. 31, 2018
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Total debt | $ 1,022,000 | $ 519,000 |  |
Financed Insurance Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  |  | $ 400,000 | $ 400,000
Interest rate (as a percent) |  |  | 5.00% | 4.89%
Total debt | $ 0 | $ 260,000 |  |

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