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Future Minimum Repayment of Bank Loans (Detail) (USD $) | Jun. 30, 2012
--- | ---
Debt Instrument [Line Items] |
Future minimum repayment | $ 30,514,316
2012 |
Debt Instrument [Line Items] |
Future minimum repayment | 14,387,580
2013 |
Debt Instrument [Line Items] |
Future minimum repayment | 7,747,158
2014 |
Debt Instrument [Line Items] |
Future minimum repayment | 6,798,526
2015 |
Debt Instrument [Line Items] |
Future minimum repayment | $ 1,581,052

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- Definition Future Minimum Payments Due + References No definition available. + Details
Name: | creg_FutureMinimumPaymentsDue
Namespace Prefix: | creg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration