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Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes (Textual) |  |  |
Provisional net tax expense | $ 2,441 |  |
Percentage of federal statutory income tax rate | 21.00% | 35.00% |

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