Note 3 - Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Current:
Federal	$ 0	$ 0
State	(9)	(7)
Foreign	0	(88)
Total current	(9)	(95)
Deferred:
Federal	0	22
State	(5)	16
Total deferred	(5)	38
Income tax expense	$ (14)	$ (57)