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Note C - Finance Receivables, Net (Details) - Financing Receivables Analysis | 12 Months Ended
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Apr. 30, 2015 | Apr. 30, 2014
Financing Receivables Analysis [Abstract] |  |
Principal collected as a percent of average finance receivables | 58.70%crmt_PrincipalCollectedAsAPercentOfAverageFinancingReceivables | 58.00%crmt_PrincipalCollectedAsAPercentOfAverageFinancingReceivables
Average down-payment percentage | 6.90%crmt_AverageDownpaymentPercentage | 6.60%crmt_AverageDownpaymentPercentage

X
- Definition Represents the 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

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

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