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v3.20.1

Statutory Reserves (Details Textual) | 12 Months Ended
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Dec. 31, 2019
Common Welfare Fund [Member] | Minimum [Member] |
Statutory Reserves (Textual) |
Percentage of net income | 5.00%
Common Welfare Fund [Member] | Maximum [Member] |
Statutory Reserves (Textual) |
Percentage of net income | 10.00%
Statutory Surplus Reserve Fund [Member] |
Statutory Reserves (Textual) |
Surplus reserve fund, description | The remaining reserve balance after such issue is not less than 25% of the registered capital.
Percentage of net income | 10.00%
Statutory surplus reserve of registered capital, percentage | 50.00%

X
- Definition Percentage of statutory surplus reserve fund reserve balance reaches of registered capital. + References No definition available. + Details
Name: | creg_PercentageOfReserveRegisteredCapital
Namespace Prefix: | creg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of statutory reserve net income for the period. + References No definition available. + Details
Name: | creg_PercentageOfStatutoryReserveNetIncome
Namespace Prefix: | creg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- 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

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

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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