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Earnings Per Share. (Details) - Schedule of computation of basic and diluted earnings per share - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Schedule of computation of basic and diluted earnings per share [Abstract] |  |  |  |  |  |
Net income attributed to Alto Ingredients, Inc. | $ 8,390 |  | $ 14,964 |  | $ 13,068 | $ (10,136)
Less: Preferred stock dividends | (315) | $ (312) | (315) | $ (315) | (627) | (630)
Basic income per share: |  |  |  |  |  |
Income available to common stockholders | $ 8,075 |  | $ 14,649 |  | $ 12,441 | (10,766)
Income available to common stockholders (in Shares) | 71,260 |  | 54,498 |  | 70,808 |
Income available to common stockholders (in Dollars per share) | $ 0.11 |  | $ 0.27 |  | $ 0.18 |
Add: Dilutive instruments | $ 669 |  |  |  | $ 1,153 |
Diluted income per share: |  |  |  |  |  |
Income available to common stockholders | $ 8,075 |  | $ 14,649 |  | $ 12,441 | $ (10,766)
Income available to common stockholders (in Shares) | 71,929 |  |  |  | 71,961 | 54,163
Income available to common stockholders (in Dollars per share) | $ 0.11 |  |  |  | $ 0.17 | $ (0.20)

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