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11. EQUITY (Details Narrative) | 3 Months Ended
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Mar. 31, 2021
Equity [Abstract] |
Statutory common reserve funds description | The Statutory Common Reserve Fund as of March 31, 2021 for SCHC, SYCI and DCHC is 16%, 14% and 0% of its registered capital respectively.

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

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- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration