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Note C - Finance Receivables, Net (Details Textual) | 9 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2022 USD ($) | Jan. 31, 2021 | Oct. 31, 2021 | Apr. 30, 2021
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% | 14.50% |  |
Collections as Percentage of Average Financing Receivables | 31.70% | 38.00% |  |
Delinquencies Greater Than 30 Days as Percentage of Average Financing Receivables |  |  | 4.00% | 2.60%
Increase (Decrease) in Average Selling Price | $ 2,892 |  |  |
Increase (Decrease) in Average Selling Price, Percentage | 21.70% |  |  |
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) | 54 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: | 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 The weighted average interest rate of finance receivables. + References No definition available. + Details
Name: | crmt_FinanceReceivablesWeightedAverageInterestRate
Namespace Prefix: | crmt_
Data Type: | dtr-types: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: | 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_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: |