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Note 4 - Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 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