Note 2 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Revenue	$ 8,912	$ 7,893
European Union [Member]
Revenue	31	320
UNITED STATES
Revenue	8,881	7,573
License [Member]
Revenue
Professional Services [Member]
Revenue	5,747	5,279
Processing and Maintenance [Member]
Revenue	2,607	2,194
Third party [Member]
Revenue	$ 558	$ 420

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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+ Details