Note 4 - Segment Information - Revenue by Geographic Area (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Revenue		$ 9,368	$ 9,938
UNITED STATES
Revenue		2,146	2,874
Non-US [Member]
Revenue	[1]	$ 7,222	$ 7,064

[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.