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FAIR VALUE ACCOUNTING (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |
Long term debt | $ 49,300 | $ 49,200
Recurring |  |
Assets: |  |
Investments | 4,222 | 3,131
Assets | 4,222 | 3,131
Recurring | Level 1 |  |
Assets: |  |
Investments | 3,587 | 2,718
Assets | 3,587 | 2,718
Recurring | Level 2 |  |
Assets: |  |
Investments | 635 | 413
Assets | $ 635 | $ 413

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