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Other Receivables (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Other Receivables (Textual) |  |
Advance to third party | $ 530 | $ 50
Advance to employees | $ 20 | 40
Maintenance cost and tax receivable |  | $ 470

X
- Definition It represent the value of employees advance. + References No definition available. + Details
Name: | creg_AdvanceToEmployees
Namespace Prefix: | creg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition It represent the value of third party advance. + References No definition available. + Details
Name: | creg_AdvanceToThirdParty
Namespace Prefix: | creg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition It represent the value of maintenance cost and tax receivable. + References No definition available. + Details
Name: | creg_MaintenanceCostAndTaxReceivable
Namespace Prefix: | creg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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