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Note M - Subsequent Events (Details Textual) - BMO Harris Bank [Member] - Revolving Credit Facility [Member] - USD ($) $ in Millions | Sep. 16, 2024 | Jul. 31, 2024
--- | --- | ---
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 340
Principal Balance Under 300 Million [Member] |  |
Line of Credit Facility, Minimum Required Available Draw Amount | $ 20 |
Principal Balance At or Over 300 Million [Member] |  |
Line of Credit Facility, Minimum Required Available Draw Amount | 50 |
Subsequent Event [Member] |  |
Line of Credit Facility, Increase In Maximum Borrowing Capacity | (20) |
Line of Credit Facility, Maximum Borrowing Capacity | $ 320 |
Line of Credit Facility, Permitted Borrowing Fee Percentage | 0.10% |

X
- Definition Represents increase in maximum borrowing capacity for line of credit. + References No definition available. + Details
Name: | crmt_LineOfCreditFacilityIncreaseInMaximumBorrowingCapacity
Namespace Prefix: | crmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the minimum amount available to draw under a credit facility that must be maintained. + References No definition available. + Details
Name: | crmt_LineOfCreditFacilityMinimumRequiredAvailableDrawAmount
Namespace Prefix: | crmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the permitted borrowing fee as a percentage. + References No definition available. + Details
Name: | crmt_LineOfCreditFacilityPermittedBorrowingFeePercentage
Namespace Prefix: | crmt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=crmt_BmoHarrisBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=crmt_PrincipalBalanceUnder300MillionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=crmt_PrincipalBalanceAtOrOver300MillionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |