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Note C - Finance Receivables, Net - Credit Quality Information for Finance Receivables (Details) - USD ($) $ in Thousands | Apr. 30, 2022 | Apr. 30, 2021
--- | --- | ---
Principle Balance | $ 1,101,497 | $ 809,537
Percent of Portfolio | 100.00% | 100.00%
Financial Asset, Not Past Due [Member] |  |
Principle Balance | $ 958,808 | $ 717,520
Percent of Portfolio | 87.05% | 88.64%
Financial Asset, 3 to 29 Days Past Due [Member] |  |
Principle Balance | $ 109,873 | $ 71,269
Percent of Portfolio | 9.97% | 8.80%
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Principle Balance | $ 22,477 | $ 13,058
Percent of Portfolio | 2.04% | 1.61%
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Principle Balance | $ 7,360 | $ 5,551
Percent of Portfolio | 0.67% | 0.69%
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Principle Balance | $ 2,979 | $ 2,139
Percent of Portfolio | 0.27% | 0.26%

X
- Definition The principal balance of finance receivables after deducting unearned finance charges from gross contract amount. + References No definition available. + Details
Name: | crmt_FinanceReceivablePrincipalBalance
Namespace Prefix: | crmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents percent of portfolio for financing receivable. + References No definition available. + Details
Name: | crmt_FinancingReceivablePercentOfPortfolio
Namespace Prefix: | crmt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetNotPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=crmt_FinancialAsset3To29DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables60To89DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |