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Note C - Finance Receivables, Net (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Apr. 30, 2015 | Apr. 30, 2014
Note C - Finance Receivables, Net (Details) [Line Items] |  |
Finance Receivables, Number of Loan Classes | 1 crmt_FinanceReceivablesNumberOfLoanClasses |
Finance Receivables, Number of Risk Pools | 1 crmt_FinanceReceivablesNumberOfRiskPools |
Net Charge Offs As Percentage of Average Finance Receivables | 27.80%crmt_NetChargeOffsAsPercentageOfAverageFinanceReceivables | 28.20%crmt_NetChargeOffsAsPercentageOfAverageFinanceReceivables
Increase in Provision for Credit Losses (in Dollars) |  | $ 7.7 crmt_IncreaseInProvisionForCreditLosses
Collections as Percentage of Average Financing Receivables | 58.70%crmt_CollectionsAsPercentageOfAverageFinancingReceivables | 58.00%crmt_CollectionsAsPercentageOfAverageFinancingReceivables
Dellinquecies Greater Than 30 Days As Percentage Of Average Finance Receivables | 5.80%crmt_DellinqueciesGreaterThan30DaysAsPercentageOfAverageFinanceReceivables | 4.40%crmt_DellinqueciesGreaterThan30DaysAsPercentageOfAverageFinanceReceivables
Minimum [Member] |  |
Note C - Finance Receivables, Net (Details) [Line Items] |  |
Financing Receivable Interest Rate | 14.00%crmt_FinancingReceivableInterestRate / us-gaap_RangeAxis = us-gaap_MinimumMember |
Financing Receivable Payment Period | 18 months |
Maximum [Member] |  |
Note C - Finance Receivables, Net (Details) [Line Items] |  |
Financing Receivable Interest Rate | 15.00%crmt_FinancingReceivableInterestRate / us-gaap_RangeAxis = us-gaap_MaximumMember |
Financing Receivable Payment Period | 42 months |

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 Dellinquecies Greater Than 30 Days As Percentage Of Average Finance Receivables + References No definition available. + Details
Name: | crmt_DellinqueciesGreaterThan30DaysAsPercentageOfAverageFinanceReceivables
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 increase in the provision of credit losses. + References No definition available. + Details
Name: | crmt_IncreaseInProvisionForCreditLosses
Namespace Prefix: | crmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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

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

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |