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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2017
Mar. 14, 2018
Jun. 30, 2017
Document And Entity Information      
Entity Registrant Name GULF RESOURCES, INC.    
Entity Central Index Key 0000885462    
Document Type 10-K/A    
Document Period End Date Dec. 31, 2017    
Amendment Flag true    
Amendment Description <p style="font: 8pt Times New Roman, Times, Serif; margin: 0">This Amendment no. 2 on Form 10-K/A is being filed to reflect the correction of an error in the previously reported fiscal year 2017 financial statements as filed on March 16, 2018 related to the one-time mandatory federal transition tax on accumulated foreign earnings. See Note 2 to the Consolidated Financial Statements included in item 8 for additional information and a reconciliation of the previously reported amounts to the restated amounts. Items that have not been amended have been omitted from this amendment.</p> <p style="font: 8pt Times New Roman, Times, Serif; margin: 0"> </p> <p style="font: 8pt Times New Roman, Times, Serif; margin: 0">The following are the sections that are impacted by the correction of the error:</p> <p style="font: 8pt Times New Roman, Times, Serif; margin: 0"> </p> <p style="font: 8pt Times New Roman, Times, Serif; margin: 0">Part 1, Item 1 - Business</p> <p style="font: 8pt Times New Roman, Times, Serif; margin: 0"> </p> <p style="font: 8pt Times New Roman, Times, Serif; margin: 0">Part II, Item 7 - Management’s Discussion and Analysis of Financial Condition and Results of Operations</p> <p style="font: 8pt Times New Roman, Times, Serif; margin: 0"> </p> <p style="font: 8pt Times New Roman, Times, Serif; margin: 0">Part II, Item 8 - Financial Statements and Supplementary Data</p> <p style="font: 8pt Times New Roman, Times, Serif; margin: 0"> </p> <p style="font: 8pt Times New Roman, Times, Serif; margin: 0">Part II, Item 9A - Controls and Procedures</p> <p style="font: 8pt Times New Roman, Times, Serif; margin: 0"> </p> <p style="font: 8pt Times New Roman, Times, Serif; margin: 0">The Company is also concurrently filing amended Quarterly Reports for the quarterly periods ended March 31, 2018 and June 30, 2018 to restate the previously issued interim financial statements due to the error described above.</p> <p style="font: 8pt Times New Roman, Times, Serif; margin: 0"> </p>    
Current Fiscal Year End Date --12-31    
Is Entity a Well-known Seasoned Issuer? No    
Is Entity a Voluntary Filer? No    
Is Entity's Reporting Status Current? Yes    
Entity Filer Category Smaller Reporting Company    
Entity Public Float     $ 52,265,626
Entity Common Stock, Shares Outstanding   46,803,791  
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2017