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FAIR VALUE ACCOUNTING (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Liabilities: |  |
Long term debt | $ 49,400 | $ 49,200
Recurring |  |
Assets: |  |
Investments | 5,147 | 3,131
Recurring | Level 1 |  |
Assets: |  |
Investments | 4,354 | 2,718
Recurring | Level 2 |  |
Assets: |  |
Investments | 793 | 413
Marketable equity securities | Recurring |  |
Assets: |  |
Investments | 4,354 | 2,718
Marketable equity securities | Recurring | Level 1 |  |
Assets: |  |
Investments | 4,354 | 2,718
Warrants | Recurring |  |
Assets: |  |
Investments | 793 | 413
Warrants | Recurring | Level 2 |  |
Assets: |  |
Investments | $ 793 | $ 413

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