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Note 2 - Investment Securities - Investment Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Securities available for sale, amortized cost $ 247,059 $ 251,819
Securities available for sale, gross unrealized gains 6,343 3,644
Securities available for sale, gross unrealized losses 220 901
Securities available for sale, at fair value 253,182 254,562
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale, amortized cost 68,746 69,984
Securities available for sale, gross unrealized gains 1,323 90
Securities available for sale, gross unrealized losses 576
Securities available for sale, at fair value 70,069 69,498
Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale, amortized cost 41,377 43,067
Securities available for sale, gross unrealized gains 370 238
Securities available for sale, gross unrealized losses 138 221
Securities available for sale, at fair value 41,609 43,084
US Government Agencies Debt Securities [Member]    
Securities available for sale, amortized cost 59,139 64,162
Securities available for sale, gross unrealized gains 1,430 473
Securities available for sale, gross unrealized losses 79
Securities available for sale, at fair value 60,569 64,556
Municipal Notes [Member]    
Securities available for sale, amortized cost 77,797 74,606
Securities available for sale, gross unrealized gains 3,220 2,843
Securities available for sale, gross unrealized losses 82 25
Securities available for sale, at fair value $ 80,935 $ 77,424