Note 10 - Income Taxes - Provision (Benefit) for Federal Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Federal	$ 0	$ 0
State	0	0
Federal	0	0
State	0	0
Total deferred tax expense	0	0
Total income tax expense	$ 0	$ 0