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Statutory Reserves (Details Textual) | 12 Months Ended
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Dec. 31, 2017
Surplus Reserve Fund [Member] |
Statutory Reserves (Textual) |
Description of fund | The Company’s Chinese subsidiaries are required to transfer 10% of their net income, as determined under PRC accounting rules and regulations, to a statutory surplus reserve fund until such reserve balance reaches 50% of the Company’s registered capital.
Total reserve percentage, description | The remaining reserve balance after such issue is not less than 25% of the registered capital.
Common Welfare Fund [Member] |
Statutory Reserves (Textual) |
Description of fund | The common welfare fund is a voluntary fund to which the Company can transfer 5% to 10% of its net income.

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- Definition Describes the statutory reserve fund. + References No definition available. + Details
Name: | creg_StatutoryReserveFundDescription
Namespace Prefix: | creg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | creg_StatutoryReservesTextualAbstract
Namespace Prefix: | creg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Description of total remaining reserve. + References No definition available. + Details
Name: | creg_TotalRemainingReserveDescription
Namespace Prefix: | creg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ValuationAllowancesAndReservesTypeAxis=creg_StatutorySurplusReserveFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ValuationAllowancesAndReservesTypeAxis=creg_CommonWelfareFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |