Note 20 - Fair Values - Losses Resulting From Non-recurring Fair Value Adjustments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Losses resulting from nonrecurring fair value adjustments	$ 21	$ 58	$ 1,260
Collateral Dependent Impaired Loans [Member]
Losses resulting from nonrecurring fair value adjustments		20	1,183
Other Real Estate Owned [Member]
Losses resulting from nonrecurring fair value adjustments	$ 21	$ 38	$ 77