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Note 4 - Segment Information - Geographical Segment Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Revenue |  | $ 10,379 | $ 8,730 | $ 20,317 | $ 16,573
UNITED STATES |  |  |  |  |
Revenue |  | 3,471 | 2,853 | 6,345 | 5,620
Non-US [Member] |  |  |  |  |
Revenue | [1] | $ 6,908 | $ 5,877 | $ 13,972 | $ 10,953
[1] | Revenue from the Central Banks, consisting of a consortium of central banks around the world, is classified as international revenue. Reporting revenue by country for this customer is not practicable.

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