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Shareholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2008 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2009 | Dec. 31, 2011
Shareholders' Equity (Textual) |  |  |  |  |  |
Purchased an aggregate amount of ordinary shares | 3,165,092 |  |  |  | 3,165,092 |
Total consideration | $ 2,800 |  |  |  | $ 2,800 |
Dividends paid per share |  | $ 0.26 | $ 0.30 | $ 0.32 |  |
Compensation costs |  | $ 200 | $ 224 | $ 182 |  |
Total unrecognized compensation costs |  | $ 408 |  |  |  |
Total compensation cost not yet recognized, weighted average period for recognition |  | 1 year 5 months 1 day |  |  |  |
Exercise of options issued to employees from treasury shares |  |  | $ 39 | 53 |  |
Treasury shares |  | 1,763,684 | 2,220,792 |  |  |
Treasury value |  | $ 1,204 | $ 1,515 |  |  |
Total intrinsic value of options exercised |  | 115 | 226 | 70 |  |
Aggregate intrinsic value of the outstanding options |  | $ 767 |  |  |  |
Options not exercised, expiration period after the day of grant |  | 5 years |  |  |  |
Aggregate intrinsic value of the exercisable options |  | $ 31 |  |  |  |
Paid dividends to shareholders |  | $ 5,100 | $ 5,800 | $ 6,200 |  |
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 granted exercise price of ordinary shares, description |  | In the years ended December 31, 2019 and 2018, the options were granted with an exercise price equal to par value of NIS 0.01. | In the years ended December 31, 2019 and 2018, the options were granted with an exercise price equal to par value of NIS 0.01. | In the year ended December 31, 2017, 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-day trading period immediately preceding the date of grant of such option, or with an exercise price equal to par value of NIS 0.01. |  |
2011 Share Incentive Plan [Member] | Israel, New Shekels [Member] |  |  |  |  |  |
Shareholders' Equity (Textual) |  |  |  |  |  |
Options for ordinary shares |  |  |  |  |  | 1,800,000
Par value granted to employees |  |  |  |  |  | $ 0.01

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