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Consolidated Statements Of Stockholders' Equity (USD $)
In Thousands, except Share data
Total
Common Stock
Accumulated Other Comprehensive Earnings (Loss)
Retained Earnings
Beginning Balance at Dec. 31, 2011 $ 30,224us-gaap_StockholdersEquity $ 17,320us-gaap_StockholdersEquity
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= us-gaap_CommonStockMember
$ 1,487us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 11,417us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Beginning Balance (in shares) at Dec. 31, 2011   4,781,597us-gaap_SharesIssued
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Net loss for the year (2,014)us-gaap_NetIncomeLoss     (2,014)us-gaap_NetIncomeLoss
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Foreign currency translation adjustments 417us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax   417us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
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Issuance of common stock under employee option plans (in shares)   3,334us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
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Issuance of common stock under employee option plans 3us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised 3us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
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Increase (Reduction) in pool of windfall tax benefits (13)us-gaap_StockIssuedDuringPeriodValueOther (13)us-gaap_StockIssuedDuringPeriodValueOther
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Issuance of restricted shares of common stock under equity incentive plan (in shares)   147,500us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
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= us-gaap_CommonStockMember
   
Issuance of restricted shares of common stock under equity incentive plan 0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures 0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
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= us-gaap_CommonStockMember
0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
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= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
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= us-gaap_RetainedEarningsMember
Cancellation of restricted shares of common stock (in shares)   (9,000)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited
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= us-gaap_CommonStockMember
   
Cancellation of restricted shares of common stock 0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures 0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
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= us-gaap_CommonStockMember
0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
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0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
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Stock-based compensation 456us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation 456us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
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= us-gaap_CommonStockMember
   
Ending Balance at Dec. 31, 2012 29,073us-gaap_StockholdersEquity 17,766us-gaap_StockholdersEquity
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= us-gaap_CommonStockMember
1,904us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
9,403us-gaap_StockholdersEquity
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= us-gaap_RetainedEarningsMember
Ending Balance (in shares) at Dec. 31, 2012   4,923,431us-gaap_SharesIssued
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= us-gaap_CommonStockMember
   
Net loss for the year (637)us-gaap_NetIncomeLoss     (637)us-gaap_NetIncomeLoss
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Foreign currency translation adjustments (677)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax   (677)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
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Issuance of common stock under employee option plans (in shares) 30,500us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 30,500us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
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Issuance of common stock under employee option plans 28us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised 28us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
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Issuance of restricted shares of common stock under equity incentive plan (in shares)   167,500us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
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= us-gaap_CommonStockMember
   
Issuance of restricted shares of common stock under equity incentive plan 0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures 0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
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= us-gaap_CommonStockMember
0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
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= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Cancellation of restricted shares of common stock (in shares)   (55,837)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Cancellation of restricted shares of common stock 0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures 0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
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0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
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= us-gaap_RetainedEarningsMember
Common stock cancelled in payment of payroll taxes due on vesting of restricted shares under employee stock incentive plans (in shares)   (19,697)crv_CommonStockCanceledForPaymentOfPayrollTaxesOnVestingOfShareBasedCompensationShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Common stock cancelled in payment of payroll taxes due on vesting of restricted shares under employee stock incentive plans (49)crv_CommonStockCanceledForPaymentOfPayrollTaxesOnVestingOfShareBasedCompensation (49)crv_CommonStockCanceledForPaymentOfPayrollTaxesOnVestingOfShareBasedCompensation
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Stock-based compensation 302us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation 302us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
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= us-gaap_CommonStockMember
   
Ending Balance at Dec. 31, 2013 28,040us-gaap_StockholdersEquity 18,047us-gaap_StockholdersEquity
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= us-gaap_CommonStockMember
1,227us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
8,766us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Ending Balance (in shares) at Dec. 31, 2013   5,045,897us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Net loss for the year (523)us-gaap_NetIncomeLoss     (523)us-gaap_NetIncomeLoss
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Foreign currency translation adjustments (769)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax   (769)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
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Issuance of common stock under employee option plans (in shares) 142,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 142,248us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
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Issuance of common stock under employee option plans 162us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised 162us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
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= us-gaap_CommonStockMember
   
Increase (Reduction) in pool of windfall tax benefits 98us-gaap_StockIssuedDuringPeriodValueOther 98us-gaap_StockIssuedDuringPeriodValueOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Issuance of restricted shares of common stock under equity incentive plan (in shares)   164,500us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Issuance of restricted shares of common stock under equity incentive plan 0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures 0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
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0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Cancellation of restricted shares of common stock (in shares)   (110,672)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Cancellation of restricted shares of common stock 0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures 0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
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= us-gaap_CommonStockMember
0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
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= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Common stock cancelled in payment of payroll taxes due on vesting of restricted shares under employee stock incentive plans (in shares)   (34,793)crv_CommonStockCanceledForPaymentOfPayrollTaxesOnVestingOfShareBasedCompensationShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Common stock cancelled in payment of payroll taxes due on vesting of restricted shares under employee stock incentive plans (129)crv_CommonStockCanceledForPaymentOfPayrollTaxesOnVestingOfShareBasedCompensation (129)crv_CommonStockCanceledForPaymentOfPayrollTaxesOnVestingOfShareBasedCompensation
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Stock-based compensation 266us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation 266us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Ending Balance at Dec. 31, 2014 $ 27,145us-gaap_StockholdersEquity $ 18,444us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 458us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 8,243us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Ending Balance (in shares) at Dec. 31, 2014   5,207,180us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember