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Note 4 - Segment Information - Long-Lived Tangible Assets by Geographical Area (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Long-lived tangible assets | $ 99,719 | $ 80,552
Operating Segments [Member] |  |
Long-lived tangible assets | 1,445 | 1,570
Operating Segments [Member] | UNITED STATES |  |
Long-lived tangible assets | 1,414 | 1,535
Operating Segments [Member] | Europe [Member] |  |
Long-lived tangible assets | $ 31 | $ 35

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