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Note 18 - Segment Reporting - Long-lived Assets by Geographic Region (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Long-lived assets | $ 280,346 | $ 282,666 | $ 263,712
Operating Segments [Member] | United States Segment [Member] |  |  |
Long-lived assets | 215,701 | 215,721 | 210,171
Operating Segments [Member] | Europe Segment [Member] |  |  |
Long-lived assets | 59,388 | 59,388 | 45,019
Operating Segments [Member] | Japan Segment [Member] |  |  |
Long-lived assets | $ 5,257 | $ 7,557 | $ 8,522

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