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Note 12 - Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2023
Notes Tables |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Plant operations |  | $ | 18 |  |  | $ | 23 |  |  | $ | 47 |  |  | $ | 48 |
Research and development cost |  |  | 22 |  |  |  | 18 |  |  |  | 40 |  |  |  | 36 |
General and administrative expense |  |  | 559 |  |  |  | 493 |  |  |  | 1,199 |  |  |  | 1,055 |
Total |  | $ | 599 |  |  | $ | 534 |  |  | $ | 1,286 |  |  | $ | 1,139 |

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