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Note B - Summary of Significant Accounting Policies - Sales (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017
Sales	$ 128,166	$ 121,263	$ 386,867	$ 384,117
Sales Used Autos [Member]
Sales	109,480	103,249	332,515	331,376
Wholesales Third Party [Member]
Sales	6,405	5,764	17,857	16,710
Service Contract Sales [Member]
Sales	7,095	7,094	21,211	21,072
Payment Protection Plan Revenue [Member]
Sales	$ 5,186	$ 5,156	$ 15,284	$ 14,959

X

- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

Name:	us-gaap_SalesRevenueGoodsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_ProductOrServiceAxis=crmt_SalesUsedAutosMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ProductOrServiceAxis=crmt_WholesalesThirdPartyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ProductOrServiceAxis=crmt_ServiceContractSalesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ProductOrServiceAxis=crmt_PaymentProtectionPlanRevenueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: