Note 4 - Balance Sheet Components (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Unbilled Receivables, Current	$ 6,600		$ 6,600		$ 7,400
Unbilled Receivables, Not Expected to be Billed and Collected in Next Twelve Months	2,300		2,300		4,100
Construction in Progress, Gross	18,500		18,500		16,600
Depreciation, Depletion and Amortization, Nonproduction, Total	1,700		5,000	$ 4,300
Goodwill, Ending Balance	2,293		2,293		2,293
Finite-Lived Intangible Assets, Net, Ending Balance	5,269		$ 5,269		$ 6,221
Finite-Lived Intangible Assets, Remaining Amortization Period (Year)			5 years 8 months 12 days
Amortization of Intangible Assets, Total	300	$ 300	$ 1,000	$ 900
Impairment of Intangible Assets, Finite-lived	$ 0		$ 0