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Nature of Activities and Summary of Significant Accounting Policies (Details Narrative) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Oct. 31, 2020
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Contract liability current   $ 200,000.0 $ 200,000 $ 200,000.0  
Allowance for doubtful accounts   $ 1,300,000 1,404,000 $ 1,300,000 $ 1,260,000
Sales revenue of high-grade alcohol   48.00%   28.00%  
Renewable natural gas fuel     115 $ 0  
Other long-term liabilities     2,823,000   $ 2,944,000
North America [Member]          
Gallon per year     65,000,000    
India [Member]          
Gallon per year     50,000,000    
Carbon Zero [Member]          
Gallon per year     45,000,000    
Kakinada Plant One [Member]          
Gallon per year     50,000,000    
Nameplate capacity     150,000    
Keyes Plant [Member]          
Gallon per year     65,000,000    
Kakinada Plant [Member]          
Gallon per year     50,000,000    
Nevo Motors [Member]          
Preferred stock shares       489,716  
Common stock shares       5,000,000  
Aemetis Plant [Member]          
Nameplate capacity, metric tonnes     1,600,000    
LCFPP [Member]          
Renewable natural gas fuel     875,000    
Awarded grants     4,200,000    
CDFA [Member]          
Awarded grants $ 7,800,000   3,200,000    
Received $ 33,000        
CEC [Member]          
Renewable natural gas fuel     5,000,000.0    
Contributions     7,900,000    
Actual expenses     5,000,000.0    
Capital expenditures     115,000    
Other long-term liabilities     $ 1,700,000