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ACCOUNTS PAYABLE, OTHER PAYABLE AND ACCRUED EXPENSES (Details Narrative) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020
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Payables and Accruals [Abstract] |  |
Deposit on subscription of subsidiary's share | $ 154,800 | $ 153,260

X
- Definition Obligations incurred through that date for deposits on subscription of subsidiary's share of expenses. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References No definition available. + Details
Name: | gure_DepositOnSubscriptionOfSubsidiarysShare
Namespace Prefix: | gure_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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