Note 2 - Contracts With Customers - Information About Receivables, Contract Assets, and Contract Liabilities From Contracts With Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	[1]
Accounts receivables	$ 17,403		$ 11,639
Deferred Revenue	(19,111)		(16,354)
Revenue recognized that was included in deferred revenue at beginning of year due to completion of services	(6,475)	$ (7,289)
Increases due to invoicing of client, net of amounts recognized as revenue	9,218	9,082
Decreases due to completion of services (or portion of services) and transferred to accounts receivable	(69)	(32)
Change due to cumulative catch-up adjustments arising from changes in expected contract consideration	13	204
Increases due to revenue recognized in the period with additional performance obligations before invoicing	81	$ 79
Other Current Assets [Member]
Contract assets included in other current assets	$ 116		$ 103

[1] Represents the December 31, 2017 balance adjusted for the ASC 606 transition adjustments.