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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) | Common Stock | Treasury Stock | Additional Paid-In Capital | Retained earnings appropriated | Retained earnings unappropriated | Cumulative Translation Adjustment | Total
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2012 | $ 19,276 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ (500,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 79,489,188 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 15,973,887 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_LegalReserveMember | $ 146,745,754 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 22,496,279 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 264,224,384 us-gaap_StockholdersEquity
Balance beginning, shares at Dec. 31, 2012 | 38,552,070 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Translation adjustments |  |  |  |  |  | 9,258,450 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 9,258,450 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Common stock issued for exercising stock options, Number of shares issued | 213,131 gure_StockIssuedDuringPeriodSharesStockOptionsExercisedNumberOfSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Common stock issued for exercising stock options | 107 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | (107)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Issuance of stock options to employees |  |  | 544,900 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 544,900 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Cashless exercise of stock options |  |  |  |  |  |  | 107 us-gaap_StockIssuedDuringPeriodValueOther
Net income |  |  |  |  | 20,967,358 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 20,967,358 us-gaap_NetIncomeLoss
Transfer to statutory common reserve fund |  |  |  | 1,291,685 gure_TransferToRetainedEarningsAppropriatedForLegalReserve / us-gaap_StatementEquityComponentsAxis = us-gaap_LegalReserveMember | (1,291,685)gure_TransferToRetainedEarningsAppropriatedForLegalReserve / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Balance at Dec. 31, 2013 | 19,383 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (500,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 80,033,981 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 17,265,572 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_LegalReserveMember | 166,421,427 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 31,754,729 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 294,995,092 us-gaap_StockholdersEquity
Balance ending, shares at Dec. 31, 2013 | 38,765,201 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Number of shares issued, ending balance at Dec. 31, 2013 |  |  |  |  |  |  | 38,765,201 us-gaap_CommonStockSharesIssued
Translation adjustments |  |  |  |  |  | (1,077,846)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (1,077,846)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Common stock repurchased |  | (61,728)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  | (61,728)us-gaap_StockRepurchasedDuringPeriodValue
Common stock repurchased, shares | (53,550)us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 53,550 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  | 53,550 us-gaap_StockRepurchasedDuringPeriodShares
Issuance of stock options to employees |  |  | 346,100 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 346,100 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Cashless exercise of stock options, Number of shares issued | 145,813 gure_StockIssuedDuringPeriodSharesOtherNumberOfSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Cashless exercise of stock options | 73 us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | (73)us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 73 us-gaap_StockIssuedDuringPeriodValueOther
Cashless exercise of stock options, shares | 145,813 us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Net income |  |  |  |  | 17,871,795 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 17,871,795 us-gaap_NetIncomeLoss
Transfer to statutory common reserve fund |  |  |  | 812,820 gure_TransferToRetainedEarningsAppropriatedForLegalReserve / us-gaap_StatementEquityComponentsAxis = us-gaap_LegalReserveMember | (812,820)gure_TransferToRetainedEarningsAppropriatedForLegalReserve / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Balance at Dec. 31, 2014 | $ 19,456 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ (561,728)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 80,380,008 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 18,078,392 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_LegalReserveMember | $ 183,480,402 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 30,676,883 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 312,073,413 us-gaap_StockholdersEquity
Balance ending, shares at Dec. 31, 2014 | 38,672,865 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Number of shares issued, ending balance at Dec. 31, 2014 | 38,911,014 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  | 38,911,014 us-gaap_CommonStockSharesIssued

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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