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Note I - Stock Based Compensation (Details) - Stock Option Plan Comparison	6 Months Ended
	Oct. 31, 2014
1997 Plan [Member]
Note I - Stock Based Compensation (Details) - Stock Option Plan Comparison [Line Items]
Minimum exercise price as a percentage of fair market value at date of grant	100.00%
Last expiration date for outstanding options	Jul. 02, 2017
2007 Plan [Member]
Note I - Stock Based Compensation (Details) - Stock Option Plan Comparison [Line Items]
Minimum exercise price as a percentage of fair market value at date of grant	100.00%
Last expiration date for outstanding options	Aug. 21, 2024
Shares available for grant at October 31, 2014	323,500

X

- Definition

Represents the minimum exercise price as a percentage of fair market value at date of grant.

+ References

No definition available.

+ Details

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X

- Details

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Namespace Prefix:	crmt_
Data Type:	xbrli:stringItemType
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X

- Definition

Date the equity-based award expires, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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X

- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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