Note 2 - Going Concern (Details Narrative) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Jun. 30, 2020	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Net loss	$ (11,519)	$ (17,422)	$ (19,130)	$ (22,006)	$ (28,296)	$ (38,647)
Net cash used in operating activities					(7,262)	(3,659)
Stockholders' deficit	$ (29,777)	$ (27,499)	$ (27,499)	$ (29,777)	(29,433)	(19,310)	$ 11,370
Default on notes payable					16,800
Cash and cash equivalent					$ 5,297	$ 28	$ 60