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Prepaid Expenses (Details) ¥ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2018 CNY (¥)	Dec. 31, 2017 USD ($)
Prepaid Expenses (Textual)
Percentage of funds raised	2.00%	2.00%
Consulting fee	$ 1,500,000	¥ 9.2
Percentage of funds actually contributed	2.00%	2.00%
Prepaid consulting expense	$ 420,000		$ 710,000
Prepaid tax	$ 35,358		$ 34,026

X

- Definition

The payment of consulting fee during the reporting period.

+ References

No definition available.

+ Details

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Namespace Prefix:	creg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The percentage of funds actually contributed as annual management fee.

+ References

No definition available.

+ Details

Name:	creg_PercentageOfFundsActuallyContributed
Namespace Prefix:	creg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of funds raised during the reporting period.

+ References

No definition available.

+ Details

Name:	creg_PercentageOfFundsRaised
Namespace Prefix:	creg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of prepaid consulting expenses as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	creg_PrepaidConsultingExpenses
Namespace Prefix:	creg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	creg_PrepaidExpensesTextualAbstract
Namespace Prefix:	creg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of asset related to consideration paid in advance for income and other taxes that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (g)(4)
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 10
-Section 05
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68074540&loc=d3e5865-108316

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6787-107765

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 10
-Section 05
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=68074540&loc=d3e5879-108316

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Balance Type:	debit
Period Type:	instant