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Note 6 - Aemetis Biogas - Series A Preferred Financing and Variable Interest Entity (Details Textual) - USD ($)
 12 Months Ended 14 Months Ended 15 Months Ended 17 Months Ended 44 Months Ended
Nov. 08, 2023
Oct. 06, 2023
Aug. 31, 2023
May 31, 2023
Feb. 08, 2023
Jan. 01, 2023
Aug. 08, 2022
Dec. 20, 2018
Dec. 31, 2023
Dec. 31, 2022
Dec. 24, 2024
Aug. 31, 2024
May 31, 2024
Aug. 08, 2022
Feb. 08, 2024
Payments for Repurchase of Redeemable Convertible Preferred Stock                 $ 30,000,000 $ (0)          
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount, Noncurrent                 113,200,000 116,000,000          
Assets                 243,406,000 207,114,000          
California Dairy Renewable Natural Gas [Member]                              
Assets                 92,794,000 77,714,000          
California Dairy Renewable Natural Gas [Member] | Asset Pledged as Collateral [Member] | Aemetis Biogas LLC [Member] | Preferred Units Series A [Member]                              
Assets                 $ 90,300,000            
Carbon Revolving Line [Member]                              
Extinguishment of Debt, Gain (Loss), Net of Tax             $ (49,400,000)                
Common Units [Member]                              
Common Stock, Capital Shares Reserved for Future Issuance (in shares)               5,000,000              
Preferred Units Series A [Member]                              
Common Units Authorized (in shares)               11,000,000              
Preferred Units, Authorized (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             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             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  
Preferred Units Series A [Member] | Third Eye Capital [Member]                              
Sale of Stock, Number of Shares Issued in Transaction (in shares)               6,000,000              
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              
PUPA Second Amendment [Member]                              
Preferred Units Issued Value             $ 116,000,000     $ 116,000,000          
PUPA Second Amendment [Member] | Forecast [Member]                              
Preferred Units Issued Value                         $ 159,000,000    
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                      
Payments for Repurchase of Redeemable Convertible Preferred Stock   $ 30,000,000                          
Proceeds from Sale of Income Tax Credits   $ 55,200,000                          
PUPA Third Amendment [Member] | Forecast [Member]                              
Preferred Units Issued Value                       $ 171,700,000      
PUPA Third Amendment [Member] | ABGL [Member]                              
Preferred Units Issued Value     $ 135,000,000                        
PUPA Fourth Amendment [Member]                              
Preferred Units Issued Value $ 110,600,000                            
Preferred Stock, Redemption Amount 108,000,000                            
Closing Fee $ 5,500,000                            
PUPA Fourth Amendment [Member] | Subsequent Event [Member]                              
Closing Fee                             $ 5,500,000
PUPA Fourth Amendment [Member] | Forecast [Member]                              
Increase in Carrying Amount of Redeemable Preferred Stock                     $ 130,000,000        
PUPA Fifth Amendment [Member]                              
Preferred Units Issued Value         $ 111,000,000                    
PUPA Fifth Amendment [Member] | Subsequent Event [Member]                              
Preferred Stock, Redemption Amount                             $ 111,000,000