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Note 2 - Investment Securities - Securities Available For Sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Securities available for sale, Amortized Cost $ 158,904 $ 166,450
Securities available for sale, Unrealized Gains 2,526 2,345
Securities available for sale, Unrealized Losses (2,745) (3,216)
Securities available for sale 158,685 165,579
US Government Agencies Debt Securities [Member]    
Securities available for sale, Amortized Cost 1,312 1,342
Securities available for sale, Unrealized Gains 8 3
Securities available for sale, Unrealized Losses
Securities available for sale 1,320 1,345
US States and Political Subdivisions Debt Securities [Member]    
Securities available for sale, Amortized Cost 106,853 111,659
Securities available for sale, Unrealized Gains 2,425 2,258
Securities available for sale, Unrealized Losses (427) (586)
Securities available for sale 108,851 113,331
Single Issue Trust Preferred Securities [Member]    
Securities available for sale, Amortized Cost 22,112 22,104
Securities available for sale, Unrealized Gains
Securities available for sale, Unrealized Losses (1,836) (2,165)
Securities available for sale 20,276 19,939
Mortgage-backed Agency Securities [Member]    
Securities available for sale, Amortized Cost 28,572 31,290
Securities available for sale, Unrealized Gains 75 66
Securities available for sale, Unrealized Losses (482) (465)
Securities available for sale 28,165 30,891
Equity Securities [Member]    
Securities available for sale, Amortized Cost 55 55
Securities available for sale, Unrealized Gains 18 18
Securities available for sale, Unrealized Losses
Securities available for sale $ 73 $ 73