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Note C - Finance Receivables, Net - Average Financing Receivable Contract Terms (Details) | 12 Months Ended
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Apr. 30, 2018 | Apr. 30, 2017
Average originating contract term (in months) (Month) | 2 years 171 days | 2 years 165 days
Portfolio weighted average contract term, including modifications (in months) (Month) | 2 years 255 days | 2 years 255 days

X
- Definition Average originating contract term. + References No definition available. + Details
Name: | crmt_AverageOriginatingContractTerm
Namespace Prefix: | crmt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Portfolio weighted average contract term, including modifications. + References No definition available. + Details
Name: | crmt_PortfolioWeightedAverageContractTermIncludingModifications
Namespace Prefix: | crmt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration