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Note B - Summary of Significant Accounting Policies (Details) (USD $)
 12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Note B - Summary of Significant Accounting Policies (Details) [Line Items]      
Number of Reportable Segments 1us-gaap_NumberOfReportableSegments    
Line of Credit Facility, Distribution Limitations, Maximum Aggregate Amount of Stock Repurchases $ 40,000,000crmt_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 2,000,000crmt_InterestEarnedOnFinancingReceivables 1,800,000crmt_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   7,700,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs  
Goodwill, Impairment Loss 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss  
Income Tax Examination, Penalties and Interest Accrued 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued  
Financing Receivable Recorded Investment Greater Than 90 Days Past Due 2,795,000crmt_FinancingReceivableRecordedInvestmenGreaterThan90DaysPastDue 1,155,000crmt_FinancingReceivableRecordedInvestmenGreaterThan90DaysPastDue  
Late Fee Income Generated by Servicing Financial Assets, Amount 2,200,000us-gaap_LateFeeIncomeGeneratedByServicingFinancialAssetsAmount 2,200,000us-gaap_LateFeeIncomeGeneratedByServicingFinancialAssetsAmount 2,000,000us-gaap_LateFeeIncomeGeneratedByServicingFinancialAssetsAmount
Advertising Expense 3,600,000us-gaap_AdvertisingExpense 4,200,000us-gaap_AdvertisingExpense 4,100,000us-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 363,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount 329,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount 290,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Stock Repurchased During Period, Shares (in Shares) 442,700us-gaap_StockRepurchasedDuringPeriodShares 325,598us-gaap_StockRepurchasedDuringPeriodShares 398,548us-gaap_StockRepurchasedDuringPeriodShares
Stock Repurchased During Period, Value $ 20,000,000us-gaap_StockRepurchasedDuringPeriodValue $ 12,800,000us-gaap_StockRepurchasedDuringPeriodValue $ 17,300,000us-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) 200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= crmt_EmployeeStockPurchasePlan2006Member		    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) 159,556us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= crmt_EmployeeStockPurchasePlan2006Member