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Note I - Stock Option Plan Comparison (Details)	9 Months Ended
	Jan. 31, 2016 shares
The 1997 Plan [Member]
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
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	0
Restated Option Plan [Member]
Minimum exercise price as a percentage of fair market value at date of grant	100.00%
Last expiration date for outstanding options	Aug. 05, 2025
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	298,750

X

- Definition

Minimum exercise price of stock options as a percentage of fair market value at date of grant.

+ References

No definition available.

+ Details

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Namespace Prefix:	crmt_
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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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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Period Type: