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Note 4 - Segment Information - Revenue by Geographic Area (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenue		$ 8,010	$ 10,379	$ 17,378	$ 20,317
UNITED STATES
Revenue		2,327	3,471	4,473	6,345
Non-US [Member]
Revenue	[1]	$ 5,683	$ 6,908	$ 12,905	$ 13,972
[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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- Definition

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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