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Note M - Subsequent Events (Details Textual)	Feb. 22, 2023	Feb. 23, 2023	Jan. 31, 2023
Maximum [Member]
Percentage of Finance Receivable Balances for Purposes of Determining Borrowing Base.			10.00%
Maximum [Member] | Subsequent Event [Member]
Percentage of Finance Receivable Balances for Purposes of Determining Borrowing Base.		15.00%
Third Amended and Restated Loan and Security Agreement | Minimum [Member] | Subsequent Event [Member]
Vehicle Contracts, Original Term (Month)	60 months
Third Amended and Restated Loan and Security Agreement | Maximum [Member] | Subsequent Event [Member]
Vehicle Contracts, Original Term (Month)	72 months

X

- Definition

Represents percentage of finance receivable balances for purpose of determining borrowing base.

+ References

No definition available.

+ Details

Name:	crmt_PercentageOfFinanceReceivableBalancesForPurposesOfDeterminingBorrowingBase
Namespace Prefix:	crmt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents original term for vehicle contracts.

+ References

No definition available.

+ Details

Name:	crmt_VehicleContractsOriginalTerm
Namespace Prefix:	crmt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
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:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=crmt_ThirdAmendedAndRestatedLoanAndSecurityAgreement
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: