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Note 16 - Segment and Related Information - Net Assets by Geographic Area (Details) - Continuing Operations [Member] - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Total net assets | $ 76,681 | $ 81,694
UNITED STATES |  |
Total net assets | 32,457 | 37,726
GERMANY |  |
Total net assets | 18,697 | 17,340
UNITED KINGDOM |  |
Total net assets | 8,867 | 11,254
Rest of the World [Member] |  |
Total net assets | $ 16,660 | $ 15,374

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