Note 16 - Income Taxes - Income Tax Expense (Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Current tax benefit	$ 0	$ 0
Deferred tax benefit	3,756	6,409
Change in valuation allowance	(3,756)	(6,409)
Income tax benefit (provision)	$ 0	$ 0