Note 3 - Balance Sheet Components (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Unbilled Receivables, Current	$ 22,700		$ 22,700		$ 22,200
Unbilled Receivables, Not Billable, Amount Expected to be Collected after Next Twelve Months	6,400		6,400		8,600
Property, Plant and Equipment, Gross, Ending Balance	57,182		57,182		46,056
Depreciation, Depletion and Amortization, Nonproduction, Total	1,200	$ 1,300	3,700	$ 3,500
Goodwill, Ending Balance	1,923		1,923		1,923
Finite-Lived Intangible Assets, Net, Ending Balance	5,317		$ 5,317		6,074
Finite-Lived Intangible Assets, Remaining Amortization Period			6 years 36 days
Amortization of Intangible Assets, Total	300	$ 200	$ 757	$ 618
Impairment of Intangible Assets, Finite-lived	0		0
Leasehold Improvements [Member]
Property, Plant and Equipment, Gross, Ending Balance	$ 5,573		$ 5,573		$ 1,980