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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2012
Marketable Securities [Abstract] |
Schedule Of Marketable Securities |
|  | 2011 |  |  | 2012 |
|  | Amortized |  | Gross unrealized |  |  | Fair market |  | Amortized |  | Gross unrealized |  |  | Fair market |
|  | Cost |  | gains |  |  | value |  | cost |  | gains |  |  | value |
Corporate debentures |  | $ | 204 |  |  | $ | 15 |  |  | $ | 219 |  |  | $ | 204 |  |  | $ | 99 |  |  | $ | 303 |
Government bonds |  |  | 12,784 |  |  |  | 378 |  |  |  | 13,162 |  |  |  | 3,515 |  |  |  | 250 |  |  |  | 3,765 |
|  | $ | 12,988 |  |  | $ | 393 |  |  | $ | 13,381 |  |  | $ | 3,719 |  |  | $ | 349 |  |  | $ | 4,068 |
Schedule Of Aggregate Maturities Of Marketable Securities |
|  | Amortized cost |  |  | Gross unrealized gain |  |  | Fair market value |
Less than 1 year |  | $ | - |  |  | $ | - |  |  | $ | - |
1-3 years |  |  | 3,515 |  |  |  | 250 |  |  |  | 3,765 |
3-5 years |  |  | 91 |  |  |  | 46 |  |  |  | 137 |
More than 5 years |  |  | 113 |  |  |  | 53 |  |  |  | 166 |
|  | $ | 3,719 |  |  | $ | 349 |  |  | $ | 4,068 |

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