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Shareholders' Equity (Stock Options Granted in 2010) (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 1 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 21, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise price of options |  |  | $ 15.28us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice |
Expense related to grant | $ 1,266us-gaap_AllocatedShareBasedCompensationExpense | $ 668us-gaap_AllocatedShareBasedCompensationExpense | $ 544us-gaap_AllocatedShareBasedCompensationExpense |
$18.82 [Member] | Share Option Plan (2004) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options granted |  |  |  | 137,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_PlanNameAxis = silc_ShareOptionPlan2004Member / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = silc_Allocation2Member
Exercise price of options |  |  |  | $ 18.82us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = silc_ShareOptionPlan2004Member / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = silc_Allocation2Member
Expiration date |  |  |  | Dec. 21, 2018
Closing price to determine expiration date |  |  |  | $ 9.41silc_ConditionForExpiration / us-gaap_PlanNameAxis = silc_ShareOptionPlan2004Member / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = silc_Allocation2Member
Percentage of options that vest and become exercisable on the second anniversary of the grant date |  |  |  | 50.00%silc_PercentageOfOptionsThatVestAndBecomeExercisableOnSecondAnniversaryOfGrantDate / us-gaap_PlanNameAxis = silc_ShareOptionPlan2004Member / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = silc_Allocation2Member
Percentage of options that vest and become exercisable on the third anniversary of the grant date |  |  |  | 50.00%silc_PercentageOfOptionsThatVestAndBecomeExercisableOnThirdAnniversaryOfGrantDate / us-gaap_PlanNameAxis = silc_ShareOptionPlan2004Member / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = silc_Allocation2Member
Expense related to grant |  |  |  |

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- Definition Percentage of options that vest and become exercisable on the second anniversary of the grant date + References No definition available. + Details
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- Definition Percentage of options that vest and become exercisable on the third anniversary of the grant date + References No definition available. + Details
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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 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 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=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Date the equity-based award expires, in CCYY-MM-DD format. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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 (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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