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Note B - Summary of Significant Accounting Policies (Details) (USD $) | 12 Months Ended
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Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013
Note B - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Number of Reportable Segments | 1 us-gaap_NumberOfReportableSegments |  |
Line of Credit Facility, Distribution Limitations, Maximum Aggregate Amount of Stock Repurchases | $ 40,000,000 crmt_LineOfCreditFacilityDistributionLimitationsMaximumAggregateAmountOfStockRepurchases |  |
Line of Credit Facility, Distribution Limitations, Percentage of Sum of Borrowing Bases | 30.00%crmt_LineOfCreditFacilityDistributionLimitationsPercentageOfSumOfBorrowingBases |  |
Line of Credit Facility, Distribution Limitations, Percentage of Consolidated Net income | 75.00%crmt_LineOfCreditFacilityDistributionLimitationsPercentageOfConsolidatedNetIncome |  |
Line of Credit Facility, Distribution Limitations, Minimum Percentage of Aggregate Funds Available | 12.50%crmt_LineOfCreditFacilityDistributionLimitationsMinimumPercentageOfAggregateFundsAvailable |  |
Interest Earned on Financing Receivables | 2,000,000 crmt_InterestEarnedOnFinancingReceivables | 1,800,000 crmt_InterestEarnedOnFinancingReceivables |
Finance Receivables, Customer Payments Due Either Weekly or Bi-Weekly, Percentage | 73.00%crmt_FinanceReceivablesCustomerPaymentsDueEitherWeeklyOrBiWeeklyPercentage |  |
Financing Receivable, Greater Than or Equal to 30 Days Past Due, Percent of Portfolio | 5.80%crmt_FinancingReceivableGreaterThanOrEqualTo30DaysPastDuePercentOfPortfolio | 4.40%crmt_FinancingReceivableGreaterThanOrEqualTo30DaysPastDuePercentOfPortfolio |
Financing Receivable, Average Days Past Due at Charge Off | 67 days |  |
Percentage of Receivable Charge Offs | 50.00%crmt_PercentageOfReceivableChargeOffs |  |
Average Age of Account At Charge-Off Date | 11 months |  |
Financing Receivable, Allowance for Credit Losses, Write-downs |  | 7,700,000 us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs |
Goodwill, Impairment Loss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss |
Income Tax Examination, Penalties and Interest Accrued | 0 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued | 0 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued |
Financing Receivable Recorded Investment Greater Than 90 Days Past Due | 2,795,000 crmt_FinancingReceivableRecordedInvestmenGreaterThan90DaysPastDue | 1,155,000 crmt_FinancingReceivableRecordedInvestmenGreaterThan90DaysPastDue |
Late Fee Income Generated by Servicing Financial Assets, Amount | 2,200,000 us-gaap_LateFeeIncomeGeneratedByServicingFinancialAssetsAmount | 2,200,000 us-gaap_LateFeeIncomeGeneratedByServicingFinancialAssetsAmount | 2,000,000 us-gaap_LateFeeIncomeGeneratedByServicingFinancialAssetsAmount
Advertising Expense | 3,600,000 us-gaap_AdvertisingExpense | 4,200,000 us-gaap_AdvertisingExpense | 4,100,000 us-gaap_AdvertisingExpense
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 4.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | 363,000 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | 329,000 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | 290,000 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Stock Repurchased During Period, Shares (in Shares) | 442,700 us-gaap_StockRepurchasedDuringPeriodShares | 325,598 us-gaap_StockRepurchasedDuringPeriodShares | 398,548 us-gaap_StockRepurchasedDuringPeriodShares
Stock Repurchased During Period, Value | $ 20,000,000 us-gaap_StockRepurchasedDuringPeriodValue | $ 12,800,000 us-gaap_StockRepurchasedDuringPeriodValue | $ 17,300,000 us-gaap_StockRepurchasedDuringPeriodValue
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | ARKANSAS |  |  |
Note B - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Concentration Risk, Percentage | 32.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_StatementGeographicalAxis = stpr_AR |  |
Minimum [Member] |  |  |
Note B - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Financing Receivable Interest Rate | 14.00%crmt_FinancingReceivableInterestRate / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Allowance for Credit Losses Primary Factor, Units Repossessed or Charged-off Evaluation Period | 1 year |  |
Maximum [Member] |  |  |
Note B - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Financing Receivable Interest Rate | 15.00%crmt_FinancingReceivableInterestRate / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Allowance for Credit Losses Primary Factor, Units Repossessed or Charged-off Evaluation Period | 5 years |  |
2006 Employee Stock Purchase Plan [Member] |  |  |
Note B - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Common Stock Discount on Shares Percentage | 15.00%crmt_CommonStockDiscountOnSharesPercentage / us-gaap_PlanNameAxis = crmt_EmployeeStockPurchasePlan2006Member |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) | 200,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = crmt_EmployeeStockPurchasePlan2006Member |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) | 159,556 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = crmt_EmployeeStockPurchasePlan2006Member |  |

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- Definition Represents the historical period of time to evaluate units repossessed or charged-off. + References No definition available. + Details
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- Definition Represents the average age of an account at charge-off date. + References No definition available. + Details
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- Definition Represents the percentage of of customer payments on Finance Receivables due either weekly or bi-weekly. + References No definition available. + Details
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- Definition Represents financing receivable, average days past due at charge off. + References No definition available. + Details
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- Definition Represents the percentage of financing receivable that is greater than or equal to 30 days past due. + References No definition available. + Details
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- Definition Represents the interest rate on installment sale contracts. + References No definition available. + Details
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- Definition Represents financing receivables that are greater than 90 days past due. + References No definition available. + Details
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- Definition Represents the interest earned on financing receivable. + References No definition available. + Details
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Balance Type: | credit
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- Definition Represents the distribution limitations, maximum aggregate amount of stock repurchases. + References No definition available. + Details
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- Definition Represents the distribution limitations, minimum percentage of aggregate funds available. + References No definition available. + Details
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- Definition Represents the distribution limitations, percentage of consolidated net income. + References No definition available. + Details
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- Definition Represents the distribution limitations, percentage of sum of borrowing bases. + References No definition available. + Details
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- Definition Represents the percentage of receivable charge offs. + References No definition available. + Details
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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition All amounts that are due to the servicer of a financial asset as a result of the debt holder not meeting the monthly payment terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122596-111746 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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