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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2020
Feb. 28, 2021
Jun. 30, 2020
Document And Entity Information      
Entity Registrant Name AEMETIS, INC.    
Entity Central Index Key 0000738214    
Document Type 10-K    
Document Period End Date Dec. 31, 2020    
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? Yes    
Entity Filer Category Non-accelerated Filer    
Entity Emerging Growth Company false    
Entity Small Business true    
Entity Shell Company false    
Entity Public Float     $ 15,083,507
Entity Common Stock, Shares Outstanding   27,099,232  
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2020    
Entity Interactive Data Current Yes    
Entity Incorporation, State or Country Code CA    
Entity File Number 000-51354