Note 3 - Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Current:
Federal	$ 0	$ 0
State	(6)	(9)
Foreign	(10)	0
Total current	(16)	(9)
Deferred:
Federal	(19)	0
State	(19)	(5)
Total deferred	(38)	(5)
Income tax expense	$ (54)	$ (14)