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16. MAJOR SUPPLIERS (Details Narrative) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Next13To24Months |  |
Top five suppliers percentage raw materials supplied | 68.20% | 54.40%
Amount due top five suppliers | $ 0 | $ 3,598,861

X
- 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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- 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