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Loans Payable (Details) - HYREF loan (entrusted loan) [Member] | 12 Months Ended
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Dec. 31, 2019 USD ($)
Entrusted loan payable at December 31, 2019, net with Xi'an TCH investment in entrusted loan | $ 20,766,903
Interest payable on entrusted loan at December 31, 2019 | 8,200,044
Add back: Xi'an TCH investment in entrusted loan | 10,750,839
Less: interest accrued from September 20, 2018 to December 31, 2019 (cut-off date for interest calculation for repayment was September 20, 2018) | (1,639,835)
Less: portion of loan with repayment due date extended to year 2023 | (11,037,528)
Add back: interest & penalty repaid by Xi'an TCH | 8,592,080
Add back: loan principle repaid by Xi'an TCH | 26,823,476
Reconciliation of repayment of HYREF loan (entrusted loan) | 62,455,979
Transfer price for Chengli Project [Member] |
Reconciliation of repayment of HYREF loan (entrusted loan) | 27,040,423
Transfer price for Xuzhou Huayu Project [Member] |
Reconciliation of repayment of HYREF loan (entrusted loan) | 17,201,342
Transfer price for Shenqiu Phase I and II Projects [Member] |
Reconciliation of repayment of HYREF loan (entrusted loan) | $ 18,214,214

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- Definition Entrusted loan payable, net with Xi’an TCH investment in entrusted loan. + References No definition available. + Details
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Namespace Prefix: | creg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of interest accrued due to cut-off date for interest calculation for repayment. + References No definition available. + Details
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Namespace Prefix: | creg_
Data Type: | xbrli:monetaryItemType
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- Definition Interest payable on entrusted loan. + References No definition available. + Details
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Namespace Prefix: | creg_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Definition Interest &amp; penalty repaid by Xi'an TCH. + References No definition available. + Details
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Namespace Prefix: | creg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Loan principle repaid by Xi'an TCH. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Portion of loan repayment due. + References No definition available. + Details
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Namespace Prefix: | creg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Xi'an TCH investment in entrusted loan. + References No definition available. + Details
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Namespace Prefix: | creg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The cash outflow for the payment of a long-term borrowing made from a related party where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Payments for Advances from Affiliates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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- Details
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- Details
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