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Income Taxes (Details Textual) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes (Textual) |  |  |
Statutory income tax rate | 34.00% | 34.00% | 34.00%
Description of deferred tax assets and liabilities | For deferred tax assets and liabilities, amounts were remeasured based on the rates expected to reverse in the future, which is now 21 percent. As noted above, the Company realized a one-time tax credit due to the TCJA of $1.7 million in 2017. |  |
Maximum [Member] |  |  |
Income Taxes (Textual) |  |  |
Statutory income tax rate | 35.00% |  |
Minimum [Member] |  |  |
Income Taxes (Textual) |  |  |
Statutory income tax rate | 21.00% |  |

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