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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY (Unaudited) (USD $)
Common Stock
Treasury Stock
Additional Paid-In Capital
Retained Earnings
Retained earnings appropriated
Cumulative Translation Adjustment
Total
Balance at Dec. 31, 2014 $ 19,456us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ (561,728)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ 80,380,008us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 183,480,402us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 18,078,392us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_StatutoryAccountingPracticesJurisdictionDomain
$ 30,676,883us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 312,073,413us-gaap_StockholdersEquity
Balance, shares at Dec. 31, 2014 38,672,865us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
           
Shares Issued at Dec. 31, 2014 38,911,014us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
238,149us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
         
Translation adjustments           (1,110,348)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(1,110,348)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Common stock repurchased   (37,713)us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
            (37,713)us-gaap_StockRepurchasedDuringPeriodValue
Common stock repurchased, shares (31,000)us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
31,000us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
         
Issuance of stock options to employees     7,400us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
         7,400us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Common stock issued for business acquisition 3,634us-gaap_StockIssuedDuringPeriodValueAcquisitions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  13,369,506us-gaap_StockIssuedDuringPeriodValueAcquisitions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
        13,373,140us-gaap_StockIssuedDuringPeriodValueAcquisitions
Common stock issued for business acquisition, shares 7,268,011us-gaap_StockIssuedDuringPeriodSharesAcquisitions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
           
Net income       5,315,271us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
      5,315,271us-gaap_NetIncomeLoss
Transfer to statutory common reserve fund       (261,712)gure_TransferToRetainedEarningsAppropriatedForLegalReserve
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
261,712gure_TransferToRetainedEarningsAppropriatedForLegalReserve
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_StatutoryAccountingPracticesJurisdictionDomain
     
Balance at Mar. 31, 2015 $ 23,090us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ (599,441)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ 93,756,914us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 188,533,961us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 18,340,104us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_StatutoryAccountingPracticesJurisdictionDomain
$ 29,566,535us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 329,621,163us-gaap_StockholdersEquity
Balance, shares at Mar. 31, 2015 45,909,876us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
269,149us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
         
Shares Issued at Mar. 31, 2015 46,179,025us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember