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Note 1 - Nature of Activities and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
California Ethanol |  | For the twelve months ended December 31, |
|  | 2022 |  |  | 2021 |
Ethanol sales |  | $ | 165,876 |  |  | $ | 162,428 |
Wet distiller's grains sales |  |  | 50,930 |  |  |  | 41,476 |
Other sales |  |  | 11,388 |  |  |  | 7,347 |
|  | $ | 228,194 |  |  | $ | 211,251 |
India Biodiesel |  | For the twelve months ended December 31,
|  | 2022 |  | 2021
Biodiesel sales |  | $ 27,041 |  | $ 465
Other sales |  | 1,070 |  | 231
|  | $ 28,111 |  | $ 696
Schedule of Cash and Cash Equivalents [Table Text Block] |
|  | As of
|  | December 31, 2022 |  | December 31, 2021
Cash and cash equivalents |  | $ 4,313 |  | $ 7,751
Restricted cash included in other current assets |  | 725 |  | -
Restricted cash included in other assets |  | 1,961 |  | -
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows |  | $ 6,999 |  | $ 7,751
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] |
|  | As of |
|  | December 31, 2022 |  |  | December 31, 2021 |
Series B preferred (post split basis) |  |  | 127 |  |  |  | 128 |
Common stock options and warrants |  |  | 5,050 |  |  |  | 3,819 |
Debt with conversion feature at $30 per share of common stock |  |  | 1,240 |  |  |  | 1,220 |
Total number of potentially dilutive shares excluded from the diluted net (loss) per share calculation |  |  | 6,417 |  |  |  | 5,167 |

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