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Note 4 - Investment Securities - Investment Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Securities available for sale, amortized cost $ 273,878 $ 259,382
Securities available for sale, gross unrealized gains 1,275 913
Securities available for sale, gross unrealized losses 3,981 4,525
Securities available for sale, at fair value 271,172 255,770
Securities-held to maturity 1 2
Securities held to maturity, gross unrealized gains
Securities held to maturity, gross unrealized losses
Securities held to maturity 1 2
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale, amortized cost 114,902 110,493
Securities available for sale, gross unrealized gains 93
Securities available for sale, gross unrealized losses 2,253 2,349
Securities available for sale, at fair value 112,649 108,237
Securities-held to maturity 1 2
Securities held to maturity, gross unrealized gains
Securities held to maturity, gross unrealized losses
Securities held to maturity 1 2
Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale, amortized cost 15,660 16,293
Securities available for sale, gross unrealized gains 1 23
Securities available for sale, gross unrealized losses 338 288
Securities available for sale, at fair value 15,323 16,028
US Government Agencies Debt Securities [Member]    
Securities available for sale, amortized cost 70,013 69,407
Securities available for sale, gross unrealized gains 14
Securities available for sale, gross unrealized losses 985 759
Securities available for sale, at fair value 69,028 68,662
Municipal Notes [Member]    
Securities available for sale, amortized cost 73,303 63,189
Securities available for sale, gross unrealized gains 1,274 783
Securities available for sale, gross unrealized losses 405 1,129
Securities available for sale, at fair value $ 74,172 $ 62,843