Note 15 - Income Taxes - Income Tax Expense (Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Current tax benefit	$ 0	$ 0
Deferred tax benefit	6,409	3,158
Change in valuation allowance	(6,409)	(3,158)
Income tax benefit (provision)	$ 0	$ 0