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Shareholders' Equity (Details Textual) $ / shares in Units, $ in Thousands | 12 Months Ended | 16 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares | Dec. 31, 2009 USD ($) shares | Dec. 31, 2011 ₪ / shares shares
Shareholders' Equity (Textual) |  |  |  |  |
Purchased an aggregate amount of ordinary shares | shares |  |  |  | 3,165,092 |
Total consideration |  |  |  | $ 2,800 |
Dividends paid per share | $ / shares | $ 0.32 | $ 0.27 | $ 0.30 |  |
Compensation costs | $ 182 | $ 137 | $ 138 |  |
Total unrecognized compensation costs | $ 447 |  |  |  |
Total compensation cost not yet recognized, weighted average period for recognition | 1 year 4 months 28 days |  |  |  |
Exercise of options issued to employees from treasury shares | $ 53 | $ 85 | 171 |  |
Treasury shares | shares | 2,352,592 | 2,398,592 |  |  |
Treasury value | $ 1,554 | $ 1,607 |  |  |
Total intrinsic value of options exercised | 70 | 51 | 176 |  |
Aggregate intrinsic value of the outstanding options | $ 1,100 |  |  |  |
Options not exercised, expiration period after the day of grant | 5 years |  |  |  |
Aggregate intrinsic value of the exercisable options | $ 11 |  |  |  |
Paid dividends to shareholders | $ 6,200 | $ 5,200 | $ 5,800 |  |
Minimum [Member] |  |  |  |  |
Shareholders' Equity (Textual) |  |  |  |  |
Outstanding options granted, vesting period | 2 years |  |  |  |
Maximum [Member] |  |  |  |  |
Shareholders' Equity (Textual) |  |  |  |  |
Outstanding options granted, vesting period | 4 years |  |  |  |
2011 Share Incentive Plan [Member] |  |  |  |  |
Shareholders' Equity (Textual) |  |  |  |  |
Options for ordinary shares | shares |  |  |  |  | 1,800,000
Par value granted to employees | ₪ / shares |  |  |  |  | ₪ 0.01
Options granted exercise price of ordinary shares, description | The options were granted with an exercise price equal to the average closing price per share of the Company's ordinary shares on the stock market during the 30 trading day period immediately preceding the date of grant of such option or with an exercise price equal to par value of NIS 0.01. | The options were granted with an exercise price equal to par value of NIS 0.01. | The options were granted with an exercise price equal to the average closing price per share of the Company's ordinary shares on the stock market during the 30 trading day period immediately preceding the date of grant of such option or with an exercise price equal to par value of NIS 0.01. |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 + Details
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