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3. Finance Receivables Measured at Fair Value (Details-Delinquency status) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Total finance receivables measured at fair value $ 743us-gaap_LoansReceivableFairValueDisclosure $ 1,664us-gaap_LoansReceivableFairValueDisclosure
Current    
Total finance receivables measured at fair value 385us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= cpss_CurrentMember		 1,266us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= cpss_CurrentMember
31-60 days    
Total finance receivables measured at fair value 210us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= cpss_Days31Member		 262us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= cpss_Days31Member
61-90 days    
Total finance receivables measured at fair value 106us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= cpss_Days61Member		 74us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= cpss_Days61Member
91+ days    
Total finance receivables measured at fair value $ 42us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= cpss_Days91Member		 $ 62us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= cpss_Days91Member