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Note 1 - Nature of Activities and Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2023
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | For the three months ended June 30, |  |  | For the six months ended June 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Ethanol sales |  | $ | 8,647 |  |  | $ | 47,656 |  |  | $ | 9,015 |  |  | $ | 85,551 |
Wet distiller's grains sales |  |  | 2,553 |  |  |  | 15,150 |  |  |  | 2,553 |  |  |  | 26,666 |
Other sales |  |  | 132 |  |  |  | 3,085 |  |  |  | 239 |  |  |  | 5,715 |
|  | $ | 11,332 |  |  | $ | 65,891 |  |  | $ | 11,807 |  |  | $ | 117,932 |
|  | For the three months ended June 30, |  |  | For the six months ended June 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Biodiesel sales |  | $ | 32,811 |  |  | $ | - |  |  | $ | 34,001 |  |  | $ | - |
Other sales |  |  | 759 |  |  |  | 10 |  |  |  | 1,039 |  |  |  | 18 |
|  | $ | 33,570 |  |  | $ | 10 |  |  | $ | 35,040 |  |  | $ | 18 |
Schedule of Cash and Cash Equivalents [Table Text Block] |
|  | As of |
|  | June 30, 2023 |  |  | December 31, 2022 |
Cash and cash equivalents |  | $ | 3,494 |  |  | $ | 4,313 |
Restricted cash included in other current assets |  |  | 10 |  |  |  | 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 |  | $ | 5,465 |  |  | $ | 6,999 |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] |
|  | As of |
|  | June 30, 2023 |  |  | June 30, 2022 |
Series B preferred (post split basis) |  |  | 126 |  |  |  | 127 |
Common stock options and warrants |  |  | 6,107 |  |  |  | 4,748 |
Debt with conversion feature at $30 per share of common stock |  |  | 1,251 |  |  |  | 1,228 |
Total number of potentially dilutive shares excluded from the diluted net (loss) per share calculation |  |  | 7,484 |  |  |  | 6,103 |

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