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Note 4 - Prepaid Expenses and Other Current Assets | 3 Months Ended
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Mar. 31, 2024
Notes to Financial Statements |
Prepaid Expenses and Other Current Assets [Text Block] | Note 4. Prepaid Expenses and Other Current Assets Prepaid expenses and other current assets as of March 31, 2024 and December 31, 2023 were as follows:
|  | March 31, |  |  | December 31, |
(in thousands) |  | 2024 |  |  | 2023 |
Metals to be used in research and development |  | $ | 1,826 |  |  | $ | 1,909 |
Research and development tax credits receivable |  |  | 1,442 |  |  |  | 1,195 |
Other |  |  | 832 |  |  |  | 568 |
Total prepaid expenses and other current assets |  | $ | 4,100 |  |  | $ | 3,672 |

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