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Organization and Business (Details Textual) | 12 Months Ended
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Apr. 30, 2025 dealership subsidiary
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Number of Operating Subsidiaries | subsidiary | 2
Number of Dealerships Operated | dealership | 154

X
- Definition Number of dealerships that the entity has. + References No definition available. + Details
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Namespace Prefix: | crmt_
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Balance Type: | na
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X
- Definition Number of operating subsidiaries that the entity has. + References No definition available. + Details
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Namespace Prefix: | crmt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
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Balance Type: | na
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