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Aemetis Biogas LLC - Series A Preferred Financing and Variable Interest Entity (Details Narrative) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 20, 2018
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Totaling Of Series A Preferred Stock Unit   $ 51,400,000    
Total Assets Of Abgl Company   49,700,000    
Long-term Liabilities   47,700,000   $ 45,000,000.0
Preferred Units Redeemed Value   300,000    
Accretion Expense   3,700,000   3,200,000
Preferred Units Issued Value   $ 3,100,000    
Preferred Stock Unit   626,000    
Preferred Units Series A [Member] | Second Tranche [Member]        
Stock Redeemed Or Called During Period Shares   20,000 20,000  
Reduced Redemption Shares   20,000    
Preferred Stock Unit   $ 89,700,000   $ 300,000
Reduced Redemption Shares Amount   14,000,000.0    
Preferred Units Series A [Member] | First Tranche [Member]        
Preferred Stock Amunt   $ 16,000,000.0    
Preferred Shares Issued   2,800,000    
Series A Preferred Stocks [Member]        
Conversion Of Common Stock Into Shares 1,200,000      
Common Stock Shares 6,000,000      
Per Shares $ 5.00      
Proceeds From Preferred Stock $ 30,000,000      
Additional Common Unit 5,000,000      
Property Tax Accrual Amount   $ 0    
Preferred Units Series A [Member]        
Preferred Stock Unit   3,200,000    
Conversion Of Common Stock Into Shares 1,200,000      
Redemption Unit Value   $ 3,000,000    
Total Amount $ 30,000,000      
Shares Percentage 75.00% 75.00%    
Increases Payment Of Cash Flow 100      
Preferred Stock Shares Authorized 11,000,000 11,000,000    
Convertible Preferred Stock 6,000,000 6,000,000    
Preference Payments $ 0.50      
Maximum Number Of Shares 5,000,000      
Redemption Per Share $ 15      
Cash Flow Amount 90,000,000      
Paid Fees $ 900,000      
Increases Conversion Of Common Stock Units 5,000,000      
Redemption Payments Increased Rate   100.00%    
Initial Rate Free Cash Flows   75.00%