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Note C - Finance Receivables, Net (Details Textual) |  |  | 6 Months Ended
--- | --- | --- | ---
May 31, 2016 | May 30, 2016 | Oct. 31, 2018 | Oct. 31, 2017
Finance Receivables, Weighted Average Interest Rate |  |  | 16.40% |
Finance Receivables, Number of Loan Classes |  |  | 1 |
Finance Receivables, Number of Risk Pools |  |  | 1 |
Net Charge Offs as Percentage of Average Finance Receivables |  |  | 13.00% | 13.80%
Minimum [Member] |  |  |  |
Financing Receivable Interest Rate |  |  | 15.00% |
Financing Receivable Payment Period |  |  | 1 year 180 days |
Maximum [Member] |  |  |  |
Financing Receivable Interest Rate | 16.50% | 15.00% | 16.50% |
Financing Receivable Payment Period |  |  | 3 years 180 days |

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 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: | 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: |