Note 11 - Aemetis Biogas LLC - Series A Preferred Financing	9 Months Ended
Sep. 30, 2025
Notes to Financial Statements
Variable Interest Entity Disclosure [Text Block]	11. Aemetis Biogas LLC – Series A Preferred Financing On December 20, 2018, Aemetis Biogas LLC ("ABGL") entered into a Series A Preferred Unit Purchase Agreement for the sale of Series A Preferred Units to Protair- X Americas, Inc., with Third Eye Capital acting as an agent. ABGL is authorized to issue 11,000,000 common units and 6,000,000 convertible, redeemable, secured, preferred membership units (the “Series A Preferred Units”). ABGL issued 6,000,000 common units to Aemetis, Inc. at a stated value of $5.00 per common unit, and 5,000,000 common units of ABGL are held in reserve as potential conversion units issuable to the Preferred Unit holder upon certain triggering events. From inception of the agreement through 2022, ABGL issued 6,000,000 Series A Preferred Units in exchange for $30.0 million in funding, reduced by a redemption of 20,000 Series A Preferred Units for $0.3 million. The original Preferred Unit Purchase Agreement included requirements for preference payments and mandatory redemption, grant of a security interest to the Preferred Unit holder in all assets of ABGL and its subsidiaries in connection with the preference payments due under the agreement, and several operating covenants. The Preferred Unit Purchase Agreement has been amended multiple times. Most recently, in October 2025, ABGL entered into an agreement entitled Tenth Waiver and Amendment to Series A Preferred Unit Purchase Agreement ("PUPA Tenth Amendment") with an effective date of August 31, 2025, that, among other provisions, extends the date by which ABGL is required to redeem all of the outstanding Series A Preferred Units to December 31, 2025, and changes the aggregate redemption price to $118.8 million, which includes a $2 million incremental fee for the PUPA Tenth Amendment. The PUPA Tenth Amendment further provides that if ABGL does not redeem the Series A Preferred Units by the redemption date, ABGL will enter into a credit agreement with Protair- X and Third Eye Capital effective as of January 1, 2026, and maturing January 1, 2027, in substantially the form attached to the PUPA Tenth Amendment and specifies that entry into such credit agreement will satisfy the obligation to redeem the Series A Preferred Units. The credit agreement would bear an interest rate equal to the greater of (i) prime rate plus 10.0% and (ii) 16.0%. We evaluated prior similar amendments in accordance with ASC 470 and applied troubled debt restructuring accounting, resulting in no gain or loss from the execution of the particular amendment. In addition, consistent with ASC 470-60, we accreted the amount of principal and interest due using the effective interest method from the starting liability on the effective date of the amendment to the amount that would be due as of the maturity date of the credit agreement. Following this methodology, we recorded Series A Preferred Unit liabilities of $131.0 million and $126.6 million as long-term liabilities as of September 30, 2025 , and December 31, 2024 , respectively.

Note 11 - Aemetis Biogas LLC - Series A Preferred Financing

9 Months Ended

Sep. 30, 2025

Variable Interest Entity Disclosure [Text Block]

11. Aemetis Biogas LLC – Series A Preferred Financing

On December 20, 2018, Aemetis Biogas LLC ("ABGL") entered into a Series A Preferred Unit Purchase Agreement for the sale of Series A Preferred Units to Protair- X Americas, Inc., with Third Eye Capital acting as an agent. ABGL is authorized to issue 11,000,000 common units and 6,000,000 convertible, redeemable, secured, preferred membership units (the “Series A Preferred Units”). ABGL issued 6,000,000 common units to Aemetis, Inc. at a stated value of $5.00 per common unit, and 5,000,000 common units of ABGL are held in reserve as potential conversion units issuable to the Preferred Unit holder upon certain triggering events. From inception of the agreement through 2022, ABGL issued 6,000,000 Series A Preferred Units in exchange for $30.0 million in funding, reduced by a redemption of 20,000 Series A Preferred Units for $0.3 million. The original Preferred Unit Purchase Agreement included requirements for preference payments and mandatory redemption, grant of a security interest to the Preferred Unit holder in all assets of ABGL and its subsidiaries in connection with the preference payments due under the agreement, and several operating covenants.

The Preferred Unit Purchase Agreement has been amended multiple times. Most recently, in October 2025, ABGL entered into an agreement entitled Tenth Waiver and Amendment to Series A Preferred Unit Purchase Agreement ("PUPA Tenth Amendment") with an effective date of August 31, 2025, that, among other provisions, extends the date by which ABGL is required to redeem all of the outstanding Series A Preferred Units to December 31, 2025, and changes the aggregate redemption price to $118.8 million, which includes a $2 million incremental fee for the PUPA Tenth Amendment. The PUPA Tenth Amendment further provides that if ABGL does not redeem the Series A Preferred Units by the redemption date, ABGL will enter into a credit agreement with Protair- X and Third Eye Capital effective as of January 1, 2026, and maturing January 1, 2027, in substantially the form attached to the PUPA Tenth Amendment and specifies that entry into such credit agreement will satisfy the obligation to redeem the Series A Preferred Units. The credit agreement would bear an interest rate equal to the greater of (i) prime rate plus 10.0% and (ii) 16.0%. We evaluated prior similar amendments in accordance with ASC 470 and applied troubled debt restructuring accounting, resulting in no gain or loss from the execution of the particular amendment. In addition, consistent with ASC 470-60, we accreted the amount of principal and interest due using the effective interest method from the starting liability on the effective date of the amendment to the amount that would be due as of the maturity date of the credit agreement. Following this methodology, we recorded Series A Preferred Unit liabilities of $131.0 million and $126.6 million as long-term liabilities as of September 30, 2025 , and December 31, 2024 , respectively.