Note 2 - Contracts With Clients - 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	$ 33,477	$ 32,465	$ 98,503	$ 95,359
Transferred over Time [Member] | Subscription Services [Member]
Revenue	30,712	28,629	90,101	84,460
Transferred over Time [Member] | Fixed, Non-subscription Services [Member]
Revenue	460	1,043	1,740	2,083
Transferred over Time [Member] | Unit Price Services [Member]
Revenue	1,135	1,187	4,206	4,585
Transferred at Point in Time [Member] | Service [Member]
Revenue	$ 1,170	$ 1,606	$ 2,456	$ 4,231