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15. BUSINESS SEGMENTS (Details 2) (USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Revenue, Major Customer [Line Items] |  |
Revenue from major customer | $ 34,910,829 us-gaap_Revenues | $ 25,592,176 us-gaap_Revenues
Shandong Maroi Chemical Company Limited [Member] |  |
Revenue, Major Customer [Line Items] |  |
Revenue from major customer | 3,864 us-gaap_Revenues / us-gaap_MajorCustomersAxis = gure_ShandongMaroiChemicalCompanyLimitedMember | 3,539 us-gaap_Revenues / us-gaap_MajorCustomersAxis = gure_ShandongMaroiChemicalCompanyLimitedMember
Percentage of Total Revenue (%) | 11.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_MajorCustomersAxis = gure_ShandongMaroiChemicalCompanyLimitedMember | 13.40%us-gaap_ConcentrationRiskPercentage1 / us-gaap_MajorCustomersAxis = gure_ShandongMaroiChemicalCompanyLimitedMember
Shandong Maroi Chemical Company Limited [Member] | Bromine Segment [Member] |  |
Revenue, Major Customer [Line Items] |  |
Revenue from major customer | 1,690 us-gaap_Revenues / us-gaap_MajorCustomersAxis = gure_ShandongMaroiChemicalCompanyLimitedMember / us-gaap_StatementBusinessSegmentsAxis = gure_BromineSegmentMember | 1,582 us-gaap_Revenues / us-gaap_MajorCustomersAxis = gure_ShandongMaroiChemicalCompanyLimitedMember / us-gaap_StatementBusinessSegmentsAxis = gure_BromineSegmentMember
Shandong Maroi Chemical Company Limited [Member] | Crude Salt Segment [Member] |  |
Revenue, Major Customer [Line Items] |  |
Revenue from major customer | 464 us-gaap_Revenues / us-gaap_MajorCustomersAxis = gure_ShandongMaroiChemicalCompanyLimitedMember / us-gaap_StatementBusinessSegmentsAxis = gure_CrudeSaltSegmentMember | 571 us-gaap_Revenues / us-gaap_MajorCustomersAxis = gure_ShandongMaroiChemicalCompanyLimitedMember / us-gaap_StatementBusinessSegmentsAxis = gure_CrudeSaltSegmentMember
Shandong Maroi Chemical Company Limited [Member] | Chemical Products Segment [Member] |  |
Revenue, Major Customer [Line Items] |  |
Revenue from major customer | $ 1,710 us-gaap_Revenues / us-gaap_MajorCustomersAxis = gure_ShandongMaroiChemicalCompanyLimitedMember / us-gaap_StatementBusinessSegmentsAxis = gure_ChemicalProductsSegmentMember | $ 1,386 us-gaap_Revenues / us-gaap_MajorCustomersAxis = gure_ShandongMaroiChemicalCompanyLimitedMember / us-gaap_StatementBusinessSegmentsAxis = gure_ChemicalProductsSegmentMember

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