Note 9 - Fair Values - Losses Resulting From Non-recurring Fair Value Adjustments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Losses resulting from nonrecurring fair value adjustments	$ 6	$ 68
Other Real Estate Owned [Member]
Losses resulting from nonrecurring fair value adjustments	$ 6	$ 68