Note 7 - Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Federal	$ 0	$ 0
State	0	0
Foreign	0	0
Current income tax benefit	0	0
Federal	0	0
State	0	0
Foreign	0	0
Deferred income tax expense	0	0
Total	$ 0	$ 0