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Note C - Finance Receivables, Net - Credit Quality Information for Finance Receivables (Details) - USD ($) $ in Thousands | Apr. 30, 2021 | Apr. 30, 2020
--- | --- | ---
Principal Balance | $ 809,537 | $ 621,182
Percent of Portfolio | 100.00% | 100.00%
Financial Asset, Not Past Due [Member] |  |
Principal Balance | $ 717,520 | $ 515,390
Percent of Portfolio | 88.64% | 82.97%
Financial Asset, 3 to 29 Days Past Due [Member] |  |
Principal Balance | $ 71,269 | $ 67,259
Percent of Portfolio | 8.80% | 10.83%
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Principal Balance | $ 13,058 | $ 25,311
Percent of Portfolio | 1.61% | 4.07%
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Principal Balance | $ 5,551 | $ 10,140
Percent of Portfolio | 0.69% | 1.63%
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Principal Balance | $ 2,139 | $ 3,082
Percent of Portfolio | 0.26% | 0.50%

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

X
- 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: |