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v3.21.2

Note G - Fair Value Measurements (Details Textual) | 1 Months Ended
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Jan. 31, 2019
Fair Value Inputs, Discount Rate, Intercompany Transactions | 38.50%
Minimum [Member] | Measurement Input, Discount Rate [Member] |
Receivables, Measurement Input | 0.34
Maximum [Member] | Measurement Input, Discount Rate [Member] |
Receivables, Measurement Input | 0.39

X
- Definition Interest rate used to find the present value of an amount to be paid or received in the future for intercompany transactions. + References No definition available. + Details
Name: | crmt_FairValueInputsDiscountRateIntercompanyTransactions
Namespace Prefix: | crmt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Value of input used to measure receivables. + References No definition available. + Details
Name: | crmt_ReceivablesMeasurementInput
Namespace Prefix: | crmt_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
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: |