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Note 12 - Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2025
Notes Tables |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three months ended June 30, |  |  | Six months ended June 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Research and development |  | $ | 316 |  |  | $ | 499 |  |  |  | 1,011 |  |  |  | 1,708 |
Sales and marketing |  |  | 126 |  |  |  | 3 |  |  |  | 255 |  |  |  | 185 |
General and administrative |  |  | 718 |  |  |  | 1,238 |  |  |  | 2,395 |  |  |  | 2,861 |
Total stock-based compensation |  | $ | 1,160 |  |  | $ | 1,740 |  |  | $ | 3,661 |  |  | $ | 4,754 |

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