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Cover - USD ($)
 12 Months Ended
Dec. 31, 2021
Feb. 28, 2022
Jun. 30, 2021
Cover [Abstract]      
Entity Registrant Name AEMETIS, INC.    
Entity Central Index Key 0000738214    
Document Type 10-K    
Amendment Flag false    
Entity Voluntary Filers No    
Current Fiscal Year End Date --12-31    
Entity Well Known Seasoned Issuer No    
Entity Small Business false    
Entity Shell Company false    
Entity Emerging Growth Company false    
Entity Current Reporting Status Yes    
Document Period End Date Dec. 31, 2021    
Entity Filer Category Accelerated Filer    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
Entity Common Stock Shares Outstanding   33,826,392  
Entity Public Float     $ 302.0
Document Annual Report true    
Document Transition Report false    
Entity File Number 000-51354    
Entity Incorporation State Country Code DE    
Entity Tax Identification Number 26-1407544    
Entity Address Address Line 1 20400 Stevens Creek Blvd    
Entity Address Address Line 2 Suite 700    
Entity Address City Or Town Cupertino    
Entity Address State Or Province CA    
Entity Address Postal Zip Code 95014    
City Area Code 408    
Icfr Auditor Attestation Flag true    
Auditor Name RSM US LLP    
Auditor Location Des Moines, Iowa    
Local Phone Number 213-0940    
Security 12b Title Common Stock, $0.001 par value    
Trading Symbol AMTX    
Security Exchange Name NASDAQ    
Entity Interactive Data Current Yes    
Auditor Firm Id 49