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Refundable Deposits from Customers for Systems Leasing (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Refundable Deposit From Customers For Systems Leasing [Abstract]
Balance of refundable deposits from customers	$ 0	$ 544,709

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- References

No definition available.

+ Details

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

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- Definition

The noncurrent portion of money or property received from customers that is to be returned upon satisfactory contract completion or as partial prepayment for goods or services to be provided in the future.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_CustomerDepositsNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant