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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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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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