Note 4 - Segment Information - Revenue by Geographic Area (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023
Revenue		$ 38,418	$ 34,851
UNITED STATES
Revenue		10,195	11,380
Non-US [Member]
Revenue	[1]	$ 28,223	$ 23,471

[1] Revenue from the Central Banks is classified as international revenue. Reporting revenue by country for this customer is not practicable.