Note 11 - Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Federal	$ 0	$ 0	$ 0
State	0	0	0
Foreign	232	169	100
Federal	0	0	0
State	0	0	0
Foreign	(7)	(1,685)	(3,224)
Total income tax expense (benefit)	$ 225	$ (1,516)	$ (3,124)