Note 13 - Segment Information - Long-lived Assets (Details) - USD ($) $ in Thousands |
Dec. 31, 2023 |
Dec. 31, 2022 |
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| Total long-lived assets | $ 266 | $ 394 |
| UNITED STATES | ||
| Total long-lived assets | 121 | 186 |
| UNITED KINGDOM | ||
| Total long-lived assets | 54 | 111 |
| CHINA | ||
| Total long-lived assets | 77 | 78 |
| Other Foreign Countries [Member] | ||
| Total long-lived assets | $ 14 | $ 19 |
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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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