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Note 11 - Business Segment and Geographic Financial Data - Geographic Segment Financial Data (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Revenues | $ 5,461 | $ 6,368 | $ 12,748 | $ 11,903 |
Assets | 49,609 |  | 49,609 |  | $ 50,124
UNITED STATES |  |  |  |  |
Revenues | 4,316 | 4,279 | 10,297 | 7,967 |
Assets | 46,191 |  | 46,191 |  | 47,007
Non-US [Member] |  |  |  |  |
Revenues | 1,145 | $ 2,089 | 2,451 | $ 3,936 |
Assets | $ 3,418 |  | $ 3,418 |  | $ 3,117

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