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Cover - shares
 6 Months Ended
Jun. 30, 2021
Jul. 31, 2021
Cover [Abstract]    
Entity Registrant Name AEMETIS, INC.  
Entity Central Index Key 0000738214  
Document Type 10-Q  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Small Business true  
Entity Shell Company false  
Entity Emerging Growth Company false  
Entity Current Reporting Status Yes  
Document Period End Date Jun. 30, 2021  
Entity Filer Category Non-accelerated Filer  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2021  
Entity Common Stock Shares Outstanding   31,689,517
Document Quarterly Report true  
Document Transition Report false  
Entity Address Address Line 2 Suite 700  
Entity Interactive Data Current Yes  
Entity File Number 001-36475  
Entity Incorporation State Country Code NV  
Entity Tax Identification Number 26-1407544  
Entity Address Address Line 1 20400 Stevens Creek Blvd  
Entity Address State Or Province CA  
Entity Address Postal Zip Code 95014  
City Area Code 408  
Local Phone Number 213-0940  
Security 12b Title Common Stock, $0.001 par value  
Trading Symbol AMTX  
Security Exchange Name NASDAQ  
Entity Address City Or Town Cupertino