Note 7 - Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Current:
Federal
State	50	41
Deferred:
Federal
State
Total provision for income taxes before valuation allowance	50	41
Change in valuation allowance
Total provision for income taxes	$ 50	$ 41