Note 3 - Contracts With Customers - Information About Receivables, Contract Assets, and Contract Liabilities From Contracts With Customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Accounts receivables	$ 11,639	$ 11,922	[1]
Deferred revenue	(16,354)	(16,244)	[1]
Revenue recognized that was included in deferred revenue at beginning of year due to completion of services	(15,785)	(16,372)
Increases due to invoicing of client, net of amounts recognized as revenue	15,631	16,119
Decreases due to completion of services (or portion of services) and transferred to accounts receivable	(53)	(74)
Change due to cumulative catch-up adjustments arising from changes in expected contract consideration	264	(145)
Increases due to revenue recognized in the period with additional performance obligations before invoicing	103	53
Other Current Assets [Member]
Contract assets included in other current assets	$ 103	$ 53	[1]

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