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Note 2 - Investment Securities - Investment Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Securities available for sale, amortized cost $ 277,755 $ 259,456
Securities available for sale, gross unrealized gains 1,564 913
Securities available for sale, gross unrealized losses 2,382 4,525
Securities available for sale, at fair value 276,937 255,844
Securities-held to maturity 1 2
Securities held to maturity, gross unrealized gains 0 0
Securities held to maturity, gross unrealized losses 0 0
Securities held to maturity, fair value 1 2
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale, amortized cost 119,472 110,493
Securities available for sale, gross unrealized gains 30 93
Securities available for sale, gross unrealized losses 1,353 2,349
Securities available for sale, at fair value 118,149 108,237
Securities-held to maturity 1 2
Securities held to maturity, gross unrealized gains 0 0
Securities held to maturity, gross unrealized losses 0 0
Securities held to maturity, fair value 1 2
Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale, amortized cost 15,390 16,293
Securities available for sale, gross unrealized gains 4 23
Securities available for sale, gross unrealized losses 200 288
Securities available for sale, at fair value 15,194 16,028
US Government Agencies Debt Securities [Member]    
Securities available for sale, amortized cost 70,934 69,407
Securities available for sale, gross unrealized gains 1 14
Securities available for sale, gross unrealized losses 498 759
Securities available for sale, at fair value 70,437 68,662
Municipal Notes [Member]    
Securities available for sale, amortized cost 71,748 63,189
Securities available for sale, gross unrealized gains 1,529 783
Securities available for sale, gross unrealized losses 331 1,129
Securities available for sale, at fair value 72,946 62,843
Debt Securities [Member]    
Securities available for sale, amortized cost 277,544 259,382
Securities available for sale, gross unrealized gains 1,564 913
Securities available for sale, gross unrealized losses 2,382 4,525
Securities available for sale, at fair value 276,726 255,770
Securities-held to maturity 1  
Securities held to maturity, fair value 1  
Mutual Funds [Member]    
Securities available for sale, amortized cost 211 74
Securities available for sale, gross unrealized gains 0 0
Securities available for sale, gross unrealized losses 0 0
Securities available for sale, at fair value $ 211 $ 74