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Note 6 - Aemetis Biogas LLC, Series A Preferred Financing and Variable Interest Entity (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 08, 2022
Dec. 20, 2018
Mar. 31, 2021
Sep. 30, 2022
Dec. 31, 2021
Series A Preferred Unit, Current       $ 109,400,000 $ 3,200,000
Liabilities, Other than Long-Term Debt, Noncurrent, Total       0 $ 45,000,000.0
Total Assets of ABGL Company       67,200,000  
Series A Preferred Units Value       $ 109,400,000  
Carbon Revolving Line [Member]          
Repayments of Debt $ 7,300,000        
Extinguishment of Debt, Gain (Loss), Net of Tax (49,400,000)        
Preferred Units Series A [Member]          
Common Units Authorized (in shares)   11,000,000      
Common Units Issued (in shares)   6,000,000      
Preferred Unit Dividend Rate Per Dollar Amount (in dollars per share)   $ 0.50      
Conversion of Stock, Shares Issued (in shares)   1,200,000   5,000,000  
Maximum Number of Shares (in shares)   5,000,000      
Redeemable Noncontrolling Interest, Equity, Preferred, Redemption Value per Unit (in dollars per share)   $ 15      
Free Cash Flow Generated by ABGL   75.00%   100.00%  
Redeemable Noncontrolling Interest Equity Redemption Value, Total   $ 90,000,000      
Fees and Commission Transfer Agent   900,000      
Debt Instrument, Collateral Amount   $ 30,000,000      
Preferred Units Issued Value     $ 3,100,000    
Preferred Units, Issued (in shares)     626,000    
Preferred Units Redeemed, Value       $ 116,000,000  
Preferred Units, Initial Fair Value 105,800,000        
Preferred Units Series A [Member] | First Tranche [Member]          
Preferred Units Issued Value       $ 16,000,000.0  
Preferred Units, Issued (in shares)       3,200,000  
Preferred Units Series A [Member] | Second Tranche [Member          
Preferred Units Issued Value       $ 14,000,000.0  
Preferred Units, Issued (in shares)       2,800,000  
Stock Redeemed or Called During Period, Shares (in shares)       20,000  
Preferred Units Redeemed, Value     $ 300,000    
Preferred Units Redeemed (in shares)     20,000    
Series A Preferred Stocks [Member]          
Common Units Issued (in shares)   6,000,000      
Common Units Issuance Value (in dollars per share)   $ 5.00      
Proceeds from Issuance of Common Units   $ 30,000,000      
Preferred Units Reserved for Future Issuance (in shares)   5,000,000      
Preferred Units Series A Redeemable By December 31, 2022 [Member] | ABGL [Member]          
Preferred Units Issued Value 116,000,000        
Preferred Units Series A Redeemable By September 30, 2022 [Member] | ABGL [Member]          
Preferred Units Issued Value $ 106,000,000