Note 2 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Total net revenue	$ 9,522	$ 5,415	$ 24,000	$ 14,046
European Union [Member]
Total net revenue	448	950	2,899	2,496
UNITED STATES
Total net revenue	9,074	4,465	21,101	11,549
License [Member]
Total net revenue	2,225	129	3,725	289
Professional Services [Member]
Total net revenue	4,579	3,178	13,206	8,050
Processing and Maintenance [Member]
Total net revenue	2,235	1,678	5,770	4,762
Third party [Member]
Total net revenue	$ 483	$ 430	$ 1,299	$ 945