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Note C - Finance Receivables, Net (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Apr. 30, 2016 | Apr. 30, 2015
Maximum [Member] |  |
Financing Receivable Interest Rate | 15.00% |
Financing Receivable Payment Period | 3 years 180 days |
Minimum [Member] |  |
Financing Receivable Payment Period | 1 year 180 days |
Finance Receivables, Number of Loan Classes | 1 |
Finance Receivables, Number of Risk Pools | 1 |
Net Charge Offs as Percentage of Average Finance Receivables | 31.30% | 27.80%
Increase in Provision for Credit Losses | $ 4.8 |
Collections as Percentage of Average Financing Receivables | 57.50% | 58.70%
Delinquecies Greater than 30 Days as Percentage of Average Finance Receivables | 3.00% | 5.80%

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 the delinquencies greater than 30 days as a percentage of average finance receivables. + References No definition available. + Details
Name: | crmt_DelinqueciesGreaterThan30DaysAsPercentageOfAverageFinanceReceivables
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of loan classes of finance receivables. + References No definition available. + Details
Name: | crmt_FinanceReceivablesNumberOfLoanClasses
Namespace Prefix: | crmt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of risk pools of finance receivables. + References No definition available. + Details
Name: | crmt_FinanceReceivablesNumberOfRiskPools
Namespace Prefix: | crmt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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: | debit
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: | 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: |