Note 18 - Fair Values - Losses Resulting From Non-recurring Fair Value Adjustments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Losses resulting from nonrecurring fair value adjustments	$ 109	$ 21
Collateral Dependent Impaired Loans [Member]
Losses resulting from nonrecurring fair value adjustments	66
Other Real Estate Owned [Member]
Losses resulting from nonrecurring fair value adjustments	$ 43	$ 21