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Note C - Finance Receivables, Net (Details Textual)	9 Months Ended
	Jan. 31, 2021 USD ($)	Jan. 31, 2020	Apr. 30, 2020	Jul. 31, 2019	Apr. 30, 2019
Finance Receivables, Weighted Average Interest Rate	16.50%
Finance Receivables, Number of Loan Classes	1
Finance Receivables, Number of Risk Pools	1
Net Charge Offs as Percentage of Average Finance Receivables	14.50%	17.50%
Collections as Percentage of Average Financing Receivables	38.00%	40.00%
Delinquencies Greater Than 30 Days as Percentage of Average Financing Receivables	2.80%	3.60%
Finance Receivables, Allowance, Percent of Principle Balance	26.50%			24.50%	25.00%
Increase (Decrease) in Average Selling Price	$ 1,720
Increase (Decrease) in Average Selling Price, Percentage	14.80%
COVID-19 Pandemic [Member]
Finance Receivables, Allowance, Percent of Principle Balance			26.50%
Minimum [Member]
Financing Receivable Interest Rate	15.00%
Financing Receivable Payment Period (Month)	18 months
Minimum [Member] | ILLINOIS
Financing Receivable Interest Rate	19.50%
Maximum [Member]
Financing Receivable Interest Rate	16.50%
Financing Receivable Payment Period (Month)	48 months
Maximum [Member] | ILLINOIS
Financing Receivable Interest Rate	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:	num: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:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The allowance for credit losses as a percentage of the principal balance related to financing receivables.

+ References

No definition available.

+ Details

Name:	crmt_FinanceReceivablesAllowancePercentOfPrincipleBalance
Namespace Prefix:	crmt_
Data Type:	num: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

The weighted average interest rate of finance receivables.

+ References

No definition available.

+ Details

Name:	crmt_FinanceReceivablesWeightedAverageInterestRate
Namespace Prefix:	crmt_
Data Type:	num:percentItemType
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:	num: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:	num: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:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=crmt_Covid19PandemicMember
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:

X

- Details

Name:	srt_StatementGeographicalAxis=stpr_IL
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: