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Note C - Finance Receivables (Details) | 6 Months Ended
--- | ---
Oct. 31, 2014 | Oct. 31, 2013
Note C - Finance Receivables (Details) [Line Items] |  |
Installment Sale Contracts,Weighted Average Interest Rate | 14.90% |
Finance Receivables, Number of Loan Classes | 1 |
Finance Receivables, Number of Risk Pools | 1 |
Net Charge Offs as Percentage of Average Financing Receivables | 13.40% | 13.10%
Collections as Percentage of Average Financing Receivables | 28.20% | 27.30%
Delinquecies Greater Than 30 Days as Percentage of Average Financing Receivables | 4.40% | 4.70%
Minimum [Member] |  |
Note C - Finance Receivables (Details) [Line Items] |  |
Financing Receivable Interest Rate | 11.00% |
Financing Receivable Payment Period | 18 months |
Maximum [Member] |  |
Note C - Finance Receivables (Details) [Line Items] |  |
Financing Receivable Interest Rate | 19.00% |
Financing Receivable Payment Period | 36 years |

X
- Definition Represents the percentage of average financing receivables collected during the reported period. + References No definition available. + Details
Name: | crmt_CollectionsAsPercentageOfAverageFinancingReceivables
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents delinquencies greater than 30 days as a percentage of financing receivables. + References No definition available. + Details
Name: | crmt_DelinqueciesGreaterThan30DaysAsPercentageOfAverageFinancingReceivables
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of loan classes. + References No definition available. + Details
Name: | crmt_FinanceReceivablesNumberOfLoanClasses
Namespace Prefix: | crmt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of risk pools. + References No definition available. + Details
Name: | crmt_FinanceReceivablesNumberOfRiskPools
Namespace Prefix: | crmt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the interest rate on installment sale contracts. + References No definition available. + Details
Name: | crmt_FinancingReceivableInterestRate
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the payment period on installment sale contracts from the sale of used vehicles. + References No definition available. + Details
Name: | crmt_FinancingReceivablePaymentPeriod
Namespace Prefix: | crmt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the weighted average interest rate on installment sale contracts. + References No definition available. + Details
Name: | crmt_InstallmentSaleContractsWeightedAverageInterestRate
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of average financing receivables charged off. + References No definition available. + Details
Name: | crmt_NetChargeOffsAsPercentageOfAverageFinancingReceivables
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | crmt_NoteCFinanceReceivablesDetailsLineItems
Namespace Prefix: | crmt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration