Note 2 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Total net revenue	$ 7,512	$ 4,573	$ 14,478	$ 8,631
European Union [Member]
Total net revenue	1,234	710	2,451	1,545
UNITED STATES
Total net revenue	6,278	3,863	12,027	7,086
License [Member]
Total net revenue	700	65	1,500	160
Professional Services [Member]
Total net revenue	4,663	2,763	8,627	4,871
Processing and Maintenance [Member]
Total net revenue	1,724	1,460	3,535	3,085
Third party [Member]
Total net revenue	$ 425	$ 285	$ 816	$ 515