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Note C - Finance Receivables, Net (Details Textual) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 31, 2016 | May 30, 2016 | Oct. 31, 2016 | Apr. 30, 2018 | Apr. 30, 2017
Financing Receivable Interest Rate |  |  |  | 16.30% |
Finance Receivables, Number of Loan Classes |  |  |  | 1 |
Finance Receivables, Number of Risk Pools |  |  |  | 1 |
Net Charge Offs as Percentage of Average Finance Receivables |  |  |  | 28.80% | 30.50%
Financing Receivable, Allowance for Credit Losses, Write-downs |  |  | $ 4,800,000 |  |
Collections as Percentage of Average Financing Receivables |  |  |  | 53.10% | 53.60%
Delinquencies Greater Than 30 Days as Percentage of Average Financing Receivables |  |  |  | 3.50% | 3.60%
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 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 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: | 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
- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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: |