Note 9 - Fair Values - Losses Resulting From Non-recurring Fair Value Adjustments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Losses resulting from nonrecurring fair value adjustments	$ 72		$ 371	$ 138
Collateral Dependent Impaired Loans [Member]
Losses resulting from nonrecurring fair value adjustments	29		328
Other Real Estate Owned [Member]
Losses resulting from nonrecurring fair value adjustments	$ 43		$ 43	$ 138