Note 15 - Income Taxes - Reconciliation of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Loss before income taxes	$ (37,121)	$ (44,306)
Theoretical tax benefit at the statutory rate (21% in 2023 and 2022)	(7,796)	(9,304)
Differences in jurisdictional tax rates	(1,465)	(1,671)
Valuation allowance	8,452	10,015
Non-deductible expenses	1,059	803
Other	(321)	(565)
Total benefit for income taxes	(71)	(722)
Net loss	$ (37,050)	$ (43,584)