Note 4 - Balance Sheet Components (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Apr. 29, 2019	Dec. 31, 2018
Unbilled Receivables, Current	$ 10,200		$ 10,200			$ 22,200
Unbilled Receivables, Not Expected to be Billed and Collected in Next Twelve Months	6,200		6,200			5,300
Depreciation, Depletion and Amortization, Nonproduction, Total	1,700	$ 1,200	4,300	$ 3,700
Goodwill, Ending Balance	2,293		2,293		$ 370	1,923
Finite-Lived Intangible Assets, Net, Ending Balance	6,538		$ 6,538			$ 5,064
Finite-Lived Intangible Assets, Remaining Amortization Period			6 years 146 days
Amortization of Intangible Assets, Total	300		$ 867	$ 757
Impairment of Intangible Assets, Finite-lived	$ 0