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Note B - Property and Equipment, Estimated Useful Lives (Details)	12 Months Ended
	Apr. 30, 2016
Furniture, Fixtures and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment Useful Lives	3 years
Furniture, Fixtures and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment Useful Lives	7 years
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment Useful Lives	5 years
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment Useful Lives	15 years
Building and Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment Useful Lives	18 years
Building and Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment Useful Lives	39 years

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=crmt_FurnitureFixturesAndEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingAndBuildingImprovementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: