EBP, Employee Termination, Mandatory Distribution, Maximum Limit

No definition available.

Name:	crmt_EBPEmployeeTerminationMandatoryDistributionMaximumLimit
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

EBP, Employee Termination, Mandatory Distribution, Without Participant Consent, Minimum Limit

+ References

No definition available.

+ Details

Name:	crmt_EBPEmployeeTerminationMandatoryDistributionWithoutParticipantConsentMinimumLimit
Namespace Prefix:	crmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Company contribution and/ or investment earning percentage vesting to the participant in Company Matching Contributions, Fixed Rate Contributions, Discretionary Profit-Sharing Contributions, Qualified Non-Elective Contributions, and Disability Contributions, upon completion of minimum service period or attainment of maximum vesting age

+ References

No definition available.

+ Details

Name:	crmt_EBPEmployerContributionVestingPercentage
Namespace Prefix:	crmt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum Vesting service period for company contribution and/ or investment earning to the participant in Company Matching Contributions, Fixed Rate Contributions, Discretionary Profit-Sharing Contributions, Qualified Non-Elective Contributions, and Disability Contributions.

+ References

No definition available.

+ Details

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

- Definition

EBP, Note Receivable From Participant, Maximum Borrowing Term

+ References

No definition available.

+ Details

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

- Definition

EBP, Note Receivable From Participant, Primary Residence, Maximum Borrowing Term

+ References

No definition available.

+ Details

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

- Definition

EBP, Number of Hours Required to Attain One Year of Service

+ References

No definition available.

+ Details

Name:	crmt_EBPNumberOfHoursRequiredToAttainOneYearOfService
Namespace Prefix:	crmt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Participant Loan, Basis Spread on Variable Rate

+ References

No definition available.

+ Details

Name:	crmt_EBPParticipantLoanBasisSpreadOnVariableRate
Namespace Prefix:	crmt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Requisite Service Period, Full-Time

+ References

No definition available.

+ Details

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

+ Details

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Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of employer matching contribution on eligible participant contribution to employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanEmployerContributionMatchingPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of participant compensation eligible for employer matching contribution for participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanEmployerContributionParticipantCompensationMatchedPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of plan asset, in forfeited nonvested account, no longer allocated to participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (j)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

+ Details

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Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingAmount
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow to total participant account balance.

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingToTotalAccountPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of minimum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

+ References

+ Details

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Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage of eligible compensation contributed for participant automatically enrolled in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanParticipantContributionAutomaticDeferralRate
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Interest rate on participant loan in schedule of asset held for investment of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (1)(i)(D)
-Publisher DOL-EBSA

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-05(a)(Schedule I))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

+ Details

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Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=crmt_EBP001Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

Name:	crmt_EBPVestingTermAxis=crmt_VestingTermOneYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	crmt_EBPVestingTermAxis=crmt_VestingTermTwoYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	crmt_EBPVestingTermAxis=crmt_VestingTermThreeYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	crmt_EBPVestingTermAxis=crmt_VestingTermFourYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	crmt_EBPVestingTermAxis=crmt_VestingTermFiveYearsOrMoreMember
Namespace Prefix:
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Balance Type:
Period Type:

Description of the Plan (Details) - EBP 001	3 Months Ended	9 Months Ended	12 Months Ended
Description of the Plan (Details) - EBP 001	Dec. 31, 2025 USD ($)	Sep. 30, 2025	Dec. 31, 2025 USD ($) h	Dec. 31, 2024 USD ($)
EBP, Description of Plan [Line Items]
Participant contribution, automatic deferral rate	5.00%	4.00%
Requisite service period to receive matching contributions			1 year
Matching contribution percentage			50.00%
Maximum participant compensation matched, percentage			6.00%
Number of hours required to attain one year of service \| h			1,000
Minimum borrowing amount	$ 1,000		$ 1,000
Maximum borrowing amount	$ 50,000		$ 50,000
Maximum borrowing to total account, percentage	50.00%		50.00%
Note receivable, maximum borrowing term			5 years
Note receivable, primary residence, maximum borrowing term			15 years
Participant loan, basis spread on variable rate			2.00%
Forfeited nonvested account	$ 190,294		$ 190,294
Employee termination, mandatory distribution, limit (less than)			7,000
Employee termination, mandatory distribution, without participant consent, Limit (above)			1,000
EBP, Unallocated
EBP, Description of Plan [Line Items]
Forfeited nonvested account	$ 2,645		$ 2,645	$ 147
Minimum
EBP, Description of Plan [Line Items]
Participant loan, interest rate			5.25%
Maximum
EBP, Description of Plan [Line Items]
Participant loan, interest rate			10.50%
One, but less than two
EBP, Description of Plan [Line Items]
Vesting service period			1 year
Vesting percentage			20.00%
Two, but less than three
EBP, Description of Plan [Line Items]
Vesting service period			2 years
Vesting percentage			40.00%
Three, but less than four
EBP, Description of Plan [Line Items]
Vesting service period			3 years
Vesting percentage			60.00%
Four, but less than five
EBP, Description of Plan [Line Items]
Vesting service period			4 years
Vesting percentage			80.00%
Five or more
EBP, Description of Plan [Line Items]
Vesting service period			5 years
Vesting percentage			100.00%