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Note C - Finance Receivables, Net (Details Textual)	1 Months Ended	9 Months Ended
	Dec. 31, 2022	Jan. 31, 2023 USD ($)	Jan. 31, 2022
Financing Receivable Interest Rate	18.00%	18.00%
Finance Receivables, Number of Loan Classes		1
Finance Receivables, Number of Risk Pools		1
Net Charge Offs as Percentage of Average Finance Receivables		16.90%	13.30%
Collections as Percentage of Average Financing Receivables		25.40%	31.70%
Delinquencies Greater Than 30 Days as Percentage of Average Financing Receivables		3.70%	4.00%
Increase (Decrease) in Average Selling Price		$ 2,114
Increase (Decrease) in Average Selling Price, Percentage		13.30%
Minimum [Member]
Financing Receivable Payment Period (Month)		18 months
Maximum [Member]
Financing Receivable Payment Period (Month)		54 months
ARKANSAS
Financing Receivable Interest Rate	16.50%	16.50%
ILLINOIS | Minimum [Member]
Financing Receivable Interest Rate	19.50%	19.50%
ILLINOIS | Maximum [Member]
Financing Receivable Interest Rate	21.50%	21.50%

X

- Definition

Represents the percentage of average financing receivables collected during the reported period.

+ References

No definition available.

+ Details

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

X

- Definition

Delinquencies greater than 30 days as a percentage of average finance receivables.

+ References

No definition available.

+ Details

Name:	crmt_DelinquenciesGreaterThan30DaysAsPercentageOfAverageFinancingReceivables
Namespace Prefix:	crmt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of loan classes of finance receivables.

+ References

No definition available.

+ Details

Name:	crmt_FinanceReceivablesNumberOfLoanClasses
Namespace Prefix:	crmt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of risk pools of finance receivables.

+ References

No definition available.

+ Details

Name:	crmt_FinanceReceivablesNumberOfRiskPools
Namespace Prefix:	crmt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the interest rate on installment sale contracts.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the payment period on installment sale contracts from the sale of used vehicles.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of increase (decrease) in average selling price during period.

+ References

No definition available.

+ Details

Name:	crmt_IncreaseDecreaseInAverageSellingPrice
Namespace Prefix:	crmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The percentage of increase(decrease) in average selling price.

+ References

No definition available.

+ Details

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

X

- Definition

The percentage of average finance receivables charged off.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Details

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

X

- Details

Name:	srt_StatementGeographicalAxis=stpr_AR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=stpr_IL
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: