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Note 2 - Investment Securities - Investment Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Securities available for sale, amortized cost $ 261,496 $ 273,878
Securities available for sale, gross unrealized gains 324 1,275
Securities available for sale, gross unrealized losses 8,607 3,981
Securities available for sale, at fair value 253,213 271,172
Securities-held to maturity 1
Securities held to maturity, gross unrealized gains  
Securities held to maturity, gross unrealized losses  
Securities held to maturity, fair value   1
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale, amortized cost 99,581 114,902
Securities available for sale, gross unrealized gains 1
Securities available for sale, gross unrealized losses 5,220 2,253
Securities available for sale, at fair value 94,362 112,649
Securities-held to maturity   1
Securities held to maturity, gross unrealized gains  
Securities held to maturity, gross unrealized losses  
Securities held to maturity, fair value   1
Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale, amortized cost 32,486 15,660
Securities available for sale, gross unrealized gains 1
Securities available for sale, gross unrealized losses 744 338
Securities available for sale, at fair value 31,742 15,323
US Government Agencies Debt Securities [Member]    
Securities available for sale, amortized cost 69,460 70,013
Securities available for sale, gross unrealized gains
Securities available for sale, gross unrealized losses 1,504 985
Securities available for sale, at fair value 67,956 69,028
Municipal Notes [Member]    
Securities available for sale, amortized cost 59,969 73,303
Securities available for sale, gross unrealized gains 323 1,274
Securities available for sale, gross unrealized losses 1,139 405
Securities available for sale, at fair value $ 59,153 $ 74,172