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16. MAJOR SUPPLIERS (Details Narrative) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Major Suppliers Details Narrative Abstract |  |
Top five suppliers percentage raw materials supplied | 0.00% | 68.20%
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

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

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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