Note 7 - Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Current:
Federal	$ 0	$ 0
State	65	50
Deferred:
Federal	0	0
State	0	0
Total provision for income taxes before valuation allowance	65	50
Change in valuation allowance	0	0
Total provision for income taxes	$ 65	$ 50