Note 9 - Income Taxes - Income Tax (Expense) Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Federal, current	$ 0	$ 0
State, current	0	0
Foreign, current	0	0
Federal, deferred	7,867	3,211
State, deferred	(1,454)	1,101
Foreign, deferred	0	0
Change in valuation allowance	(6,413)	(4,312)
Total Benefit for Income Taxes	$ 0	$ 0