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17. MAJOR SUPPLIERS (Details Narrative) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Risks and Uncertainties [Abstract] |  |
Top five suppliers percentage raw materials supplied | 100.00% | 100.00%
Amount due top five suppliers | $ 0 | $ 0

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- Definition Custom Element. + References No definition available. + Details
Name: | GURE_AmountDueTopFiveSuppliers
Namespace Prefix: | GURE_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Custom Element. + References No definition available. + Details
Name: | GURE_TopFiveSuppliersPercentageRawMaterialsSupplied
Namespace Prefix: | GURE_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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