Note 2 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue	$ 10,304	$ 9,522	$ 26,250	$ 24,000
European Union [Member]
Revenue	364	448	948	2,899
UNITED STATES
Revenue	9,940	9,074	25,302	21,101
License [Member]
Revenue	1,600	2,225	1,600	3,725
Professional Services [Member]
Revenue	5,392	4,579	15,827	13,206
Processing and Maintenance [Member]
Revenue	2,950	2,235	7,817	5,770
Third party [Member]
Revenue	$ 362	$ 483	$ 1,006	$ 1,299