Note 2 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue	$ 8,053	$ 7,512	$ 15,946	$ 14,478
European Union [Member]
Revenue	264	1,234	584	2,451
UNITED STATES
Revenue	7,789	6,278	15,362	12,027
License [Member]
Revenue		700		1,500
Professional Services [Member]
Revenue	5,156	4,663	10,435	8,627
Processing and Maintenance [Member]
Revenue	2,673	1,724	4,867	3,535
Third party [Member]
Revenue	$ 224	$ 425	$ 644	$ 816