Note 13 - Income Taxes - Components of the Provision for (Benefit From) Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current taxes:
United States	$ (2)	$ 3	$ 11
Foreign	0	0	0
State	(82)	(16)	22
Total current taxes	(84)	(13)	33
Deferred taxes:
United States	(1,188)	(8,777)	0
Foreign	0	0	0
State	(360)	(2,882)	1,811
Total deferred taxes	(1,548)	(11,659)	1,811
(Benefit from) provision for income taxes	$ (1,632)	$ (11,672)	$ 1,844