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Shareholders' Equity (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Nov. 30, 2005
Class of Stock [Line Items] |  |  |
Stock Repurchased and Retired During Period, Value | $ 389,000 | $ 949,000 |
Own-share Lending Arrangement, Shares, Outstanding | 1,459,233 | 1,459,233 | 5,677,950
Treasury Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Stock Repurchased and Retired During Period, Shares | 158,202 | 311,022 |
Stock Repurchased and Retired During Period, Value | $ 389,000 | $ 949,000 |

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