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STOCK-BASED COMPENSATION PLAN (Narrative) (Details) | 1 Months Ended | 0 Months Ended | 12 Months Ended | 1 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
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Aug. 27, 2014 USD ($) | Oct. 16, 2013 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Aug. 27, 2014 Mr. Guohua Ku [Member] USD ($) | Sep. 05, 2014 Mr. Guohua Ku [Member] Installments One [Member] USD ($) | Sep. 05, 2014 Mr. Guohua Ku [Member] Installments One [Member] CNY | Sep. 12, 2014 Mr. Guohua Ku [Member] Installments Two [Member] USD ($) | Sep. 12, 2014 Mr. Guohua Ku [Member] Installments Two [Member] CNY | Dec. 31, 2014 Director One [Member] | Dec. 31, 2014 Director Two [Member] | Dec. 31, 2014 Director [Member] | Dec. 31, 2013 Director [Member] | Oct. 07, 2010 Independent Directors Compensation Plan [Member] USD ($) | Jan. 20, 2010 Independent Directors Compensation Plan [Member] USD ($) | Oct. 30, 2009 Independent Directors Compensation Plan [Member] USD ($) | Dec. 31, 2014 Independent Directors Compensation Plan [Member] USD ($) | Dec. 31, 2014 Cashless Exercise [Member] Independent Directors Compensation Plan [Member] | Dec. 31, 2013 Cashless Exercise [Member] Independent Directors Compensation Plan [Member] | Nov. 11, 2009 Employee Stock Option [Member] USD ($) | Dec. 31, 2014 Employee Stock Option [Member] USD ($) | Dec. 31, 2013 Employee Stock Option [Member] USD ($) | Dec. 31, 2012 Employee Stock Option [Member] USD ($) | Aug. 13, 2010 Employee Stock Option [Member] Second and Third Tranche [Member] | Nov. 09, 2009 Employee Stock Option [Member] Options Vested [Member] | Nov. 11, 2009 Employee Stock Option [Member] Unvested Options [Member] | Dec. 31, 2014 Employee Stock Option [Member] Cashless Exercise [Member] | Dec. 31, 2013 Employee Stock Option [Member] Cashless Exercise [Member] | Nov. 11, 2009 2007 Plan [Member] Employee Stock Option [Member] | Aug. 04, 2008 2007 Plan [Member] Employee Stock Option [Member] USD ($) | Dec. 31, 2014 2007 Plan [Member] Employee Stock Option [Member] | Nov. 11, 2009 Two Other Employees [Member] Employee Stock Option [Member] USD ($) | Aug. 13, 2010 Managerial And Non Managerial Employees [Member] 2007 Plan [Member] Employee Stock Option [Member] USD ($) | Dec. 31, 2013 NASDAQ Global Market [Member] Employee Stock Option [Member]
Granted |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = creg_IndependentDirectorsCompensationPlanMember | 40,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = creg_IndependentDirectorsCompensationPlanMember | 130,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = creg_IndependentDirectorsCompensationPlanMember |  |  |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |  |  | 3,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = creg_TwoThousandSevenPlanMember |  | 290,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / dei_LegalEntityAxis = creg_TwoOtherEmployeesMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember | 2,200,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / dei_LegalEntityAxis = creg_ManagerialAndNonManagerialEmployeesMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = creg_TwoThousandSevenPlanMember |
Common Stock, Par or Stated Value Per Share |  |  | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = creg_TwoThousandSevenPlanMember |  |  |  |
Grant date excersise price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.68 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = creg_IndependentDirectorsCompensationPlanMember | $ 1.85 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = creg_IndependentDirectorsCompensationPlanMember |  |  |  |  | $ 0 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember | $ 0 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |  |  | $ 0.80 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = creg_TwoThousandSevenPlanMember |  | $ 2.35 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / dei_LegalEntityAxis = creg_TwoOtherEmployeesMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember | $ 3.05 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / dei_LegalEntityAxis = creg_ManagerialAndNonManagerialEmployeesMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = creg_TwoThousandSevenPlanMember |
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Estimated life |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years | 5 years | 5 years |  |  |  | 5 years |  |  |  | 5 years |  |  |  |  |  | 5 years |  |  |  |
Volatility percentage rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 87.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = creg_IndependentDirectorsCompensationPlanMember | 100.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = creg_IndependentDirectorsCompensationPlanMember | 100.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = creg_IndependentDirectorsCompensationPlanMember |  |  |  | 100.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  | 92.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / creg_TrancheAxis = creg_SecondAndThirdTrancheMember |  |  |  |  |  | 100.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = creg_TwoThousandSevenPlanMember |  |  |  |
Risk free interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.54%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = creg_IndependentDirectorsCompensationPlanMember | 3.54%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = creg_IndependentDirectorsCompensationPlanMember | 3.54%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = creg_IndependentDirectorsCompensationPlanMember |  |  |  | 3.84%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  | 3.54%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / creg_TrancheAxis = creg_SecondAndThirdTrancheMember |  |  |  |  |  | 2.76%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = creg_TwoThousandSevenPlanMember |  |  |  |
Dividend yield |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = creg_IndependentDirectorsCompensationPlanMember | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = creg_IndependentDirectorsCompensationPlanMember | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = creg_IndependentDirectorsCompensationPlanMember |  |  |  | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / creg_TrancheAxis = creg_SecondAndThirdTrancheMember |  |  |  |  |  | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = creg_TwoThousandSevenPlanMember |  |  |  |
Grant date fair value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 83,000 creg_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValueOfAwards / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = creg_IndependentDirectorsCompensationPlanMember | $ 142,000 creg_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValueOfAwards / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = creg_IndependentDirectorsCompensationPlanMember | $ 183,000 creg_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValueOfAwards / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = creg_IndependentDirectorsCompensationPlanMember |  |  |  | $ 518,513 creg_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValueOfAwards / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |  |  |  |  | $ 5,040,000 creg_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValueOfAwards / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = creg_TwoThousandSevenPlanMember |  |  |  |
Vesting terms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | According to the vesting terms, the options granted were divided into three tranches, (i) 1/3 (one third) of the total number of shares subject to the options shall vest and become exercisable if the Company meets its minimum revenue and earnings goals in the Company’s guidance for 2010 as delivered in its earnings releases and/or conference calls in the first quarter of 2010, such vesting to occur immediately upon completion of the annual audit confirming the financial results for 2010; and (ii) an additional 1/3 (one third) of the total number of shares subject to the options shall vest and become exercisable if the Company meets certain financial goals of 2011 which will be set out and decided by the Compensation Committee, such vesting to occur immediately upon Compensation Committee’s determination that the Company has met such goals for 2011; and (iii) the remaining 1/3 (one third) of the total number of shares subject to the options shall vest and become exercisable if the Company meets certain financial goals of 2012 which is set out and decided by the Compensation Committee, such vesting is to occur immediately upon Compensation Committee’s determination that the Company has met such goals for 2012. |
Cancelled/forfeited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 87,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod / us-gaap_AwardTypeAxis = creg_OptionsVestedMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember | 203,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod / us-gaap_AwardTypeAxis = creg_UnvestedOptionsMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |  |  |
Exercised |  |  |  |  |  |  |  |  |  | 50,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_TitleOfIndividualAxis = creg_DirectorOneMember | 10,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_TitleOfIndividualAxis = creg_DirectorTwoMember | 60,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember | 10,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  |  |  |  | 60,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = creg_CashlessExerciseMember / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = creg_IndependentDirectorsCompensationPlanMember | 10,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = creg_CashlessExerciseMember / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = creg_IndependentDirectorsCompensationPlanMember |  | 0 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember | 2,650,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  | 0 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = creg_CashlessExerciseMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember | 2,650,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = creg_CashlessExerciseMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  | 2,650,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / dei_LegalEntityAxis = creg_NasdaqGlobalMarketMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember
Compensation per month |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000 creg_AverageMonthlyProfessionalFees / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = creg_IndependentDirectorsCompensationPlanMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities |  |  | 36,124 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities | 5,261 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities |  |  |  |  |  | 30,575 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_TitleOfIndividualAxis = creg_DirectorOneMember | 5,549 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_TitleOfIndividualAxis = creg_DirectorTwoMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,887,411 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / dei_LegalEntityAxis = creg_NasdaqGlobalMarketMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember
Stock Issued During Period, Shares, Restricted Stock Award, Gross |  | 75,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Gross |  | 187,500 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Other |  |  |  |  | 13,829,074 us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = creg_MrGuohuaKuMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Price Per Share |  |  |  |  | $ 1.37 us-gaap_SaleOfStockPricePerShare / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = creg_MrGuohuaKuMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  |  |  | 12,000,000 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_RelatedPartyTransactionAxis = creg_InstallmentsOneMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = creg_MrGuohuaKuMember | 74,050,000 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_RelatedPartyTransactionAxis = creg_InstallmentsOneMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = creg_MrGuohuaKuMember | 6,910,000 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_RelatedPartyTransactionAxis = creg_InstallmentsTwoMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = creg_MrGuohuaKuMember | 42,850,000 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_RelatedPartyTransactionAxis = creg_InstallmentsTwoMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = creg_MrGuohuaKuMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Price | $ 1.49 us-gaap_SharePrice |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Resale Period | 180 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options and warrants expenses |  |  | $ 187,500 us-gaap_ShareBasedCompensation | $ 0 us-gaap_ShareBasedCompensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercisable, Number |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = creg_IndependentDirectorsCompensationPlanMember |  |  |  | 733,333 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember | 1,023,333 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember | 3,733,333 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.83 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = creg_IndependentDirectorsCompensationPlanMember |  |  |  | $ 3.05 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember | $ 2.85 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember | $ 1.36 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 months 22 days |  |  |  | 7 months 13 days | 1 year 4 months 24 days | 1 year 1 month 2 days |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,200,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = creg_TwoThousandSevenPlanMember |  |  |

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- Definition Average Monthly Professional Fees + References No definition available. + Details
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Namespace Prefix: | creg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Grant Date Fair Value Of Awards + References No definition available. + Details
Name: | creg_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValueOfAwards
Namespace Prefix: | creg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This concept ensure shares resale period for during the period. + References No definition available. + Details
Name: | creg_SharesResalePeriod
Namespace Prefix: | creg_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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