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Note C - Finance Receivables, Net (Details Textual)	1 Months Ended	9 Months Ended
	Dec. 31, 2023	Jan. 31, 2024 USD ($)	Jan. 31, 2023 USD ($)
Financing Receivable Interest Rate	18.00%	18.25%
Finance Receivables, Number of Loan Classes		1
Finance Receivables, Number of Risk Pools		1
Financing Receivable, Allowance for Credit Loss, Recovery		$ 2,000,000	$ 2,000,000
Collections as Percentage of Average Financing Receivables		3.90%
Increase (Decrease) in Average Selling Price		$ 1,003
Increase (Decrease) in Average Selling Price, Percentage		5.60%
ARKANSAS
Financing Receivable Interest Rate	16.75%
TENNESSEE
Financing Receivable Interest Rate		23.00%
Maximum [Member]
Financing Receivable Interest Rate		18.25%
Financing Receivable Payment Period		69 months
Maximum [Member] | ARKANSAS
Financing Receivable Interest Rate		16.75%
Maximum [Member] | ILLINOIS
Financing Receivable Interest Rate		21.50%
Minimum [Member]
Financing Receivable Payment Period		18 months
Minimum [Member] | ILLINOIS
Financing Receivable Interest Rate		19.50%

X

- Definition

Represents the percentage of average financing receivables collected during the reported period.

+ References

No definition available.

+ Details

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Namespace Prefix:	crmt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of loan classes of finance receivables.

+ References

No definition available.

+ Details

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Namespace Prefix:	crmt_
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X

- Definition

Number of risk pools of finance receivables.

+ References

No definition available.

+ Details

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Namespace Prefix:	crmt_
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Balance Type:	na
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X

- Definition

Represents the interest rate on installment sale contracts.

+ References

No definition available.

+ Details

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Namespace Prefix:	crmt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the payment period on installment sale contracts from the sale of used vehicles.

+ References

No definition available.

+ Details

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Namespace Prefix:	crmt_
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Balance Type:	na
Period Type:	duration

X

- Definition

The amount of increase (decrease) in average selling price during period.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The percentage of increase(decrease) in average selling price.

+ References

No definition available.

+ Details

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X

- Definition

Amount of increase in allowance for credit loss on financing receivable from recovery.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479294/326-20-55-79

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-SubTopic 10
-Topic 310
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
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- Details

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