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Note 2 - Investment Securities - Investment Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Securities available for sale, amortized cost $ 257,205 $ 266,437
Securities available for sale, gross unrealized gains 1,441 862
Securities available for sale, gross unrealized losses 3,611 5,458
Securities available for sale, fair value 255,035 261,841
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale, amortized cost 89,739 94,746
Securities available for sale, gross unrealized gains 1
Securities available for sale, gross unrealized losses 2,365 3,489
Securities available for sale, fair value 87,375 91,257
Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale, amortized cost 36,356 33,222
Securities available for sale, gross unrealized gains 91 152
Securities available for sale, gross unrealized losses 351 382
Securities available for sale, fair value 36,096 32,992
US Government Agencies Debt Securities [Member]    
Securities available for sale, amortized cost 65,791 75,461
Securities available for sale, gross unrealized gains 149 59
Securities available for sale, gross unrealized losses 739 1,016
Securities available for sale, fair value 65,201 74,504
Municipal Notes [Member]    
Securities available for sale, amortized cost 65,319 63,008
Securities available for sale, gross unrealized gains 1,200 651
Securities available for sale, gross unrealized losses 156 571
Securities available for sale, fair value $ 66,363 $ 63,088