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Note C - Finance Receivables, Net - Credit Quality Information for Finance Receivables (Details) - USD ($) $ in Thousands | Oct. 31, 2021 | Apr. 30, 2021 | Oct. 31, 2020
--- | --- | --- | ---
Principle Balance | $ 966,425 | $ 809,537 | $ 692,775
Percent of Portfolio | 100.00% | 100.00% | 100.00%
Financial Asset, Not Past Due [Member] |  |  |
Principle Balance | $ 819,314 | $ 717,520 | $ 604,306
Percent of Portfolio | 84.78% | 88.64% | 87.23%
Financial Asset, 3 to 29 Days Past Due [Member] |  |  |
Principle Balance | $ 108,563 | $ 71,269 | $ 71,412
Percent of Portfolio | 11.23% | 8.80% | 10.31%
Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Principle Balance | $ 24,499 | $ 13,058 | $ 12,434
Percent of Portfolio | 2.53% | 1.61% | 1.79%
Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Principle Balance | $ 7,509 | $ 5,551 | $ 3,047
Percent of Portfolio | 0.78% | 0.69% | 0.44%
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Principle Balance | $ 6,540 | $ 2,139 | $ 1,576
Percent of Portfolio | 0.68% | 0.26% | 0.23%

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- 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

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- 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: |

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- 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: |