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INCOME TAXES: (Details textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |
Federal statutory income tax rate (percent) | 21.00% |  |  |
Part of unrecognized tax benefits | $ 922 | $ 825 | $ 698 | $ 513
Increase (decrease) in interest and penalities | 23 | 4 | 4 |
Income tax examination, penalties and interest accrued | $ 52 | $ 40 | $ 31 |

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