Significant Accounting Policies (Policies)	9 Months Ended
Sep. 30, 2025
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	*Basis of Presentation and Consolidation* These consolidated financial statements include the accounts of Aemetis, Inc. and its subsidiaries. We consolidate all entities in which we have a controlling financial interest. A controlling financial interest is usually obtained through ownership of a majority of the voting interests. However, an enterprise must consolidate a variable interest entity (“VIE”) if the enterprise is the primary beneficiary of the VIE, even if the enterprise does not own a majority of the voting interests. The primary beneficiary is the party that has both the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance, and the obligation to absorb losses or the right to receive benefits from the VIE that could potentially be significant to the VIE. We consider Aemetis Biogas LLC ("ABGL") to be a VIE because Aemetis, Inc. owns all of the outstanding common units of ABGL and is the primary beneficiary of ABGL's operations; accordingly, the assets, liabilities, and operations of ABGL and its subsidiaries are consolidated in these financial statements. All intercompany balances and transactions have been eliminated in consolidation. The accompanying consolidated condensed balance sheet as of September 30, 2025, the consolidated condensed statements of operations and comprehensive income (loss) for the three and nine months ended September 30, 2025 and 2024, the consolidated condensed statements of cash flows for the nine months ended September 30, 2025 and 2024, and the consolidated statements of stockholders’ deficit for the three and nine months ended September 30, 2025 and 2024, are unaudited. The consolidated condensed balance sheet as of December 31, 2024, is derived from the 2024 audited consolidated financial statements and notes thereto. The financial statements in this report should be read in conjunction with the 2024 audited consolidated financial statements and notes thereto included in our annual report on Form 10-K for the year ended December 31, 2024. There have been no material changes to our significant accounting policies disclosed in Note 1 - Nature of Activities and Summary of Significant Accounting Policies and other Notes to the Consolidated Financial Statements included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2024. The accompanying consolidated condensed financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) and pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. In the opinion of Company’s management, the unaudited interim consolidated condensed financial statements as of and for the three and nine months ended September 30, 2025 and 2024, have been prepared on the same basis as the audited consolidated statements as of and for the year ended December 31, 2024, and reflect all adjustments, consisting primarily of normal recurring adjustments, necessary for the fair presentation of its statement of financial position, results of operations and cash flows. The results of operations for the three and nine months ended September 30, 2025, are not necessarily indicative of the operating results for any subsequent quarter, for the full fiscal year, or any future periods.
Regulatory Income Taxes, Policy [Policy Text Block]	Investment Tax Credits We sell certain transferable Investment Tax Credits ("ITCs") that we generate from qualifying investments to third-party purchasers. We account for ITC sales in accordance with ASC 740 by electing the flow-through method. For the nine months ended September 30, 2025, the contractual net proceeds of ITC sales of $7.0 million are recorded as an income tax benefit. There were no ITC sales during the three months ended September 30, 2025.

Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2025

Basis of Accounting, Policy [Policy Text Block]

Basis of Presentation and Consolidation

These consolidated financial statements include the accounts of Aemetis, Inc. and its subsidiaries. We consolidate all entities in which we have a controlling financial interest. A controlling financial interest is usually obtained through ownership of a majority of the voting interests. However, an enterprise must consolidate a variable interest entity (“VIE”) if the enterprise is the primary beneficiary of the VIE, even if the enterprise does not own a majority of the voting interests. The primary beneficiary is the party that has both the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance, and the obligation to absorb losses or the right to receive benefits from the VIE that could potentially be significant to the VIE. We consider Aemetis Biogas LLC ("ABGL") to be a VIE because Aemetis, Inc. owns all of the outstanding common units of ABGL and is the primary beneficiary of ABGL's operations; accordingly, the assets, liabilities, and operations of ABGL and its subsidiaries are consolidated in these financial statements.

All intercompany balances and transactions have been eliminated in consolidation.

The accompanying consolidated condensed balance sheet as of September 30, 2025, the consolidated condensed statements of operations and comprehensive income (loss) for the three and nine months ended September 30, 2025 and 2024, the consolidated condensed statements of cash flows for the nine months ended September 30, 2025 and 2024, and the consolidated statements of stockholders’ deficit for the three and nine months ended September 30, 2025 and 2024, are unaudited. The consolidated condensed balance sheet as of December 31, 2024, is derived from the 2024 audited consolidated financial statements and notes thereto.

The financial statements in this report should be read in conjunction with the 2024 audited consolidated financial statements and notes thereto included in our annual report on Form 10-K for the year ended December 31, 2024. There have been no material changes to our significant accounting policies disclosed in Note 1 - Nature of Activities and Summary of Significant Accounting Policies and other Notes to the Consolidated Financial Statements included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2024.

The accompanying consolidated condensed financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) and pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. In the opinion of Company’s management, the unaudited interim consolidated condensed financial statements as of and for the three and nine months ended September 30, 2025 and 2024, have been prepared on the same basis as the audited consolidated statements as of and for the year ended December 31, 2024, and reflect all adjustments, consisting primarily of normal recurring adjustments, necessary for the fair presentation of its statement of financial position, results of operations and cash flows. The results of operations for the three and nine months ended September 30, 2025, are not necessarily indicative of the operating results for any subsequent quarter, for the full fiscal year, or any future periods.

Regulatory Income Taxes, Policy [Policy Text Block]

Investment Tax Credits

We sell certain transferable Investment Tax Credits ("ITCs") that we generate from qualifying investments to third-party purchasers. We account for ITC sales in accordance with ASC 740 by electing the flow-through method. For the nine months ended September 30, 2025, the contractual net proceeds of ITC sales of $7.0 million are recorded as an income tax benefit. There were no ITC sales during the three months ended September 30, 2025.