Note 8 - Income Taxes - Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Federal	$ 0	$ 0	$ 0
State	0	33	0
Foreign	9	0	0
Total current tax provision	9	33	0
Federal	(17,703)	(3,297)	(1,541)
State	(2,424)	0	0
Foreign	0	0	0
Total deferred tax benefit	(20,127)	(3,297)	(1,541)
Income tax benefit	$ (20,118)	$ (3,264)	$ (1,541)