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Note 3 - Contracts With Customers - Information About Receivables, Contract Assets, and Contract Liabilities From Contracts With Customers (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Jan. 01, 2018
[1]
Dec. 31, 2017
Accounts receivable, net $ 16,544 $ 14,674 $ 14,806
Deferred Revenue (18,642) (16,642) $ (16,878)
Revenue recognized that was included in deferred revenue at beginning of period due to completion of services (15,363)    
Increases due to invoicing of client, net of amounts recognized as revenue 17,522    
Decreases due to completion of services (or portion of services) and transferred to accounts receivable (71)    
Change due to cumulative catch-up adjustments arising from changes in expected contract consideration (145)    
Increases due to revenue recognized in the period with additional performance obligations before invoicing 65    
Other Current Assets [Member]      
Contract assets included in other current assets $ 68 $ 74  
[1] Represents the December 31, 2017 balance adjusted for the ASC 606 transition adjustments.