Shareholders' Equity (Details - Options outstanding and exercisable) - shares shares in Thousands	Dec. 31, 2023	Dec. 31, 2022
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	8,125	11,167
Number of shares, exercisable	6,062	7,770
$2.00 - $2.99 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	1,410	1,445
Number of shares, exercisable	1,082	775
$3.00 - $3.99 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	2,473	3,785
Number of shares, exercisable	2,473	3,495
$4.00 - $4.99 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	2,539	2,739
Number of shares, exercisable	1,929	1,802
$6.00 - $6.99 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	0	740
Number of shares, exercisable	0	740
$7.00 - $7.99 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	0	748
Number of shares, exercisable	0	748
$10.00 - $10.99 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	1,703	1,710
Number of shares, exercisable	578	210

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=cpss_Range1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=cpss_Range2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=cpss_Range3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=cpss_Range4Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=cpss_Range5Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=cpss_Range6Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: