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Shareholders' Equity (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 0 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | May 16, 2015 | May 05, 2015 | Apr. 29, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance at the beginning of the period | $ 76,016 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 70,335 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |
Net income | 1,272 us-gaap_NetIncomeLoss | 485 us-gaap_NetIncomeLoss |  |  |
Share-based compensation | 238 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition | 84 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition |  |  |
Tax benefit - stock option exercise | 7 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation | 87 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  |  |
Exercise of stock options | 20 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions | 1,021 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions |  |  |
Dividends | (319)us-gaap_DividendsCash | 0 us-gaap_DividendsCash |  |  |
Stock issued for acquisitions | 0 us-gaap_StockIssuedDuringPeriodValueAcquisitions | 1,679 us-gaap_StockIssuedDuringPeriodValueAcquisitions |  |  |
Unrealized gain or loss on investments, net of tax | 55 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | 73 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax |  |  |
Foreign currency translation adjustment | (180)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax | 0 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax |  |  |
Balance at end of the period | $ 77,109 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 73,764 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |
Subsequent Event [Member] | QuarterlyDividend-Q1 [Member] |  |  |  |  |
Stockholders' Equity Note [Abstract] |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  |  |  |  | $ 0.035 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_DividendsAxis = clro_QuarterlyDividendQ1Member / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Dividends Payable, Date to be Paid |  |  | May 15, 2015 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Dividends Payable, Date of Record |  |  |  | May 04, 2015 |

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