Note 3 - Contracts With Customers - Information About Receivables, Contract Assets, and Contract Liabilities From Contracts With Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Accounts receivables	$ 14,296		$ 13,923
Deferred Revenue	(17,614)		(15,585)
Revenue recognized that was included in deferred revenue at beginning of year due to completion of services	(7,115)	$ (6,475)
Increases due to invoicing of client, net of amounts recognized as revenue	8,739	9,218
Increases due to acquisition	239
Decreases due to completion of services (or portion of services) and transferred to accounts receivable	(73)	(69)
Change due to cumulative catch-up adjustments arising from changes in expected contract consideration	164	13
Increases due to revenue recognized in the period with additional performance obligations before invoicing	28	$ 81
Other Current Assets [Member]
Contract assets included in other current assets	$ 266		$ 311