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v3.21.2

Note A - Organization and Business (Details Textual) | 12 Months Ended
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Apr. 30, 2021
Number of Operating Subsidiaries | 2
Number of Dealerships Operated | 151

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

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