Note 13 - Income Taxes - Components of the Provision for (Benefit From) Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
United States	$ 0	$ (2)	$ 3
Foreign	0	0	0
State	11	(82)	(16)
Total current taxes	11	(84)	(13)
United States	9	(1,188)	(8,777)
Foreign	0	0	0
State	(3)	(360)	(2,882)
Total deferred taxes	6	(1,548)	(11,659)
(Benefit from) provision for income taxes	$ 17	$ (1,632)	$ (11,672)