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Note 4 - Segment Information - Geographical Segment Revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Revenue $ 34,851 $ 30,197
UNITED STATES    
Revenue 11,380 10,029
Non-US [Member]    
Revenue [1] $ 23,471 $ 20,168
[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.