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Note 1 - Nature of Activities and Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2023
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | For the three months ended March 31, |
|  | 2023 |  |  | 2022 |
Ethanol sales |  | $ | 368 |  |  | $ | 37,896 |
Wet distiller's grains sales |  |  | - |  |  |  | 11,517 |
Other sales |  |  | 107 |  |  |  | 2,628 |
|  | $ | 475 |  |  | $ | 52,041 |
|  | For the three months ended March 31, |
|  | 2023 |  |  | 2022 |
Biodiesel sales |  | $ | 1,190 |  |  | $ | - |
Other sales |  |  | 280 |  |  |  | 8 |
|  | $ | 1,470 |  |  | $ | 8 |
Schedule of Cash and Cash Equivalents [Table Text Block] |
|  | As of
|  | March 31, 2023 |  | December 31, 2022
Cash and cash equivalents |  | $ 4,131 |  | $ 4,313
Restricted cash included in other current assets |  | 127 |  | 725
Restricted cash included in other assets |  | 1,961 |  | 1,961
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows |  | $ 6,219 |  | $ 6,999
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] |
|  | As of |
|  | March 31, 2023 |  |  | March 31, 2022 |
Series B preferred (post split basis) |  |  | 127 |  |  |  | 127 |
Common stock options and warrants |  |  | 6,125 |  |  |  | 4,774 |
Debt with conversion feature at $30 per share of common stock |  |  | 1,246 |  |  |  | 1,223 |
Total number of potentially dilutive shares excluded from the diluted net (loss) per share calculation |  |  | 7,498 |  |  |  | 6,124 |

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