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Note C - Finance Receivables (Details) - Financing Receivables Analysis | 9 Months Ended
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Jan. 31, 2014 | Jan. 31, 2013
Financing Receivables Analysis [Abstract] |  |
Principal collected as a percent of average finance receivables | 40.50% | 42.80%
Average down-payment percentage | 5.60% | 5.80%

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- Definition Average down-payment percentage + References No definition available. + Details
Name: | crmt_AverageDownpaymentPercentage
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Principal collected as a percent of average finance receivables + References No definition available. + Details
Name: | crmt_PrincipalCollectedAsAPercentOfAverageFinanceReceivables
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration