Note 3 - Balance Sheet Components (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Unbilled Receivables, Current	$ 23,200		$ 23,200		$ 22,200
Unbilled Receivables, Not Billable, Amount Expected to be Collected after Next Twelve Months	7,300		7,300		8,600
Depreciation, Depletion and Amortization, Nonproduction, Total	1,300	$ 1,200	2,500	$ 2,300
Goodwill, Ending Balance	1,923		1,923		1,923
Finite-Lived Intangible Assets, Net, Ending Balance	5,569		$ 5,569		$ 6,074
Finite-Lived Intangible Assets, Remaining Amortization Period			6 years 113 days
Amortization of Intangible Assets, Total	300	$ 200	$ 505	$ 376
Impairment of Intangible Assets, Finite-lived	$ 0		$ 0