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Note 6 - Aemetis Biogas LLC, Series A Preferred Financing and Variable Interest Entity (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended 12 Months Ended 15 Months Ended
Aug. 31, 2023
May 31, 2023
Jan. 01, 2023
Aug. 08, 2022
Dec. 20, 2018
Jun. 30, 2023
Dec. 31, 2022
Aug. 31, 2024
Series A Preferred Units Value           $ 129.7 $ 116.0  
Total Assets of ABGL Company           $ 79.0    
Carbon Revolving Line [Member]                
Repayments of Debt       $ 7.3        
Extinguishment of Debt, Gain (Loss), Net of Tax       (49.4)        
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         $ 90.0      
Fees and Commission Transfer Agent         0.9      
Debt Instrument, Collateral Amount         $ 30,000.0      
Preferred Units Series A [Member] | First Tranche [Member]                
Preferred Units, Issued (in shares)           3,200,000    
Preferred Units Issued Value           $ 16.0    
Preferred Units Series A [Member] | Second Tranche [Member                
Preferred Units, Issued (in shares)           2,800,000    
Preferred Units Issued Value           $ 14.0    
Stock Redeemed or Called During Period, Shares (in shares)           20,000    
Preferred Units Redeemed, Value           $ 0.3    
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         $ 30,000.0      
Preferred Units Reserved for Future Issuance (in shares)         5,000,000      
PUPA Second Amendment [Member]                
Preferred Units Issued Value     $ 159.0 116.0        
PUPA Second Amendment [Member] | ABGL [Member]                
Preferred Units Issued Value     $ 125.0 $ 106.0        
PUPA Third Amendment [Member]                
Preferred Units Issued Value   $ 127.2           $ 171.7
PUPA Third Amendment [Member] | ABGL [Member] | Forecast [Member]                
Preferred Units Issued Value $ 135.0