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Nature of Activities and Summary of Significant Accounting Policies (Details Narrative) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2020 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Contract liability current |  | $ 200,000.0 | $ 200,000 | $ 200,000.0 |
Allowance for doubtful accounts |  | $ 1,300,000 | 1,404,000 | $ 1,300,000 | $ 1,260,000
Sales revenue of high-grade alcohol |  | 48.00% |  | 28.00% |
Renewable natural gas fuel |  |  | 115 | $ 0 |
Other long-term liabilities |  |  | 2,823,000 |  | $ 2,944,000
North America [Member] |  |  |  |  |
Gallon per year |  |  | 65,000,000 |  |
India [Member] |  |  |  |  |
Gallon per year |  |  | 50,000,000 |  |
Carbon Zero [Member] |  |  |  |  |
Gallon per year |  |  | 45,000,000 |  |
Kakinada Plant One [Member] |  |  |  |  |
Gallon per year |  |  | 50,000,000 |  |
Nameplate capacity |  |  | 150,000 |  |
Keyes Plant [Member] |  |  |  |  |
Gallon per year |  |  | 65,000,000 |  |
Kakinada Plant [Member] |  |  |  |  |
Gallon per year |  |  | 50,000,000 |  |
Nevo Motors [Member] |  |  |  |  |
Preferred stock shares |  |  |  | 489,716 |
Common stock shares |  |  |  | 5,000,000 |
Aemetis Plant [Member] |  |  |  |  |
Nameplate capacity, metric tonnes |  |  | 1,600,000 |  |
LCFPP [Member] |  |  |  |  |
Renewable natural gas fuel |  |  | 875,000 |  |
Awarded grants |  |  | 4,200,000 |  |
CDFA [Member] |  |  |  |  |
Awarded grants | $ 7,800,000 |  | 3,200,000 |  |
Received | $ 33,000 |  |  |  |
CEC [Member] |  |  |  |  |
Renewable natural gas fuel |  |  | 5,000,000.0 |  |
Contributions |  |  | 7,900,000 |  |
Actual expenses |  |  | 5,000,000.0 |  |
Capital expenditures |  |  | 115,000 |  |
Other long-term liabilities |  |  | $ 1,700,000 |  |

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