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Note 6 - Aemetis Biogas LLC, Series A Preferred Financing and Variable Interest Entity (Details Textual) - USD ($)
 9 Months Ended 12 Months Ended 15 Months Ended
Nov. 08, 2023
Aug. 31, 2023
May 31, 2023
Jan. 01, 2023
Aug. 08, 2022
Dec. 20, 2018
Sep. 30, 2023
Dec. 31, 2022
Aug. 31, 2024
Series A Preferred Units Value             $ 137,800,000 $ 116,000,000  
Total Assets of ABGL Company             $ 141,400,000    
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)           $ 0.5      
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 Series A [Member] | First Tranche [Member]                  
Preferred Units, Issued (in shares)             3,200,000    
Preferred Units Issued Value             $ 16,000,000    
Preferred Units Series A [Member] | Second Tranche [Member                  
Preferred Units, Issued (in shares)             2,800,000    
Preferred Units Issued Value             $ 14,000,000    
Stock Redeemed or Called During Period, Shares (in shares)             20,000    
Preferred Units Redeemed, Value             $ 300,000    
Series A Preferred Stocks [Member]                  
Common Units Issued (in shares)           6,000,000      
Common Units Issuance Value (in dollars per share)           $ 5      
Proceeds from Issuance of Common Units           $ 30,000,000      
Preferred Units Reserved for Future Issuance (in shares)           5,000,000      
PUPA Second Amendment [Member]                  
Preferred Units Issued Value       $ 159,000,000 116,000,000        
PUPA Second Amendment [Member] | ABGL [Member]                  
Preferred Units Issued Value       $ 125,000,000 $ 106,000,000        
PUPA Third Amendment [Member]                  
Preferred Units Issued Value     $ 127,200,000           $ 171,700,000
PUPA Third Amendment [Member] | ABGL [Member]                  
Preferred Units Issued Value   $ 135,000,000              
PUPA Fourth Amendment [Member] | Subsequent Event [Member]                  
Preferred Units Issued Value $ 102,500,000                
Closing Fee $ 5,500,000