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Document and Entity Information (USD $)
 12 Months Ended
Dec. 31, 2011
Oct. 25, 2012
Jun. 30, 2011
Document And Entity Information      
Entity Registrant Name AEMETIS, INC.    
Entity Central Index Key 0000738214    
Document Type 10-K    
Document Period End Date Dec. 31, 2011    
Amendment Flag false    
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? No    
Entity Filer Category Smaller Reporting Company    
Entity Public Float     $ 15,363,775
Entity Common Stock, Shares Outstanding   170,548,507  
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2011