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Note 2 - Investment Securities - Investment Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Securities available for sale, amortized cost $ 255,899 $ 251,819
Securities available for sale, gross unrealized gains 8,250 3,644
Securities available for sale, gross unrealized losses 115 901
Securities available for sale, fair value 264,034 254,562
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale, amortized cost 66,320 69,984
Securities available for sale, gross unrealized gains 1,472 90
Securities available for sale, gross unrealized losses 26 576
Securities available for sale, fair value 67,766 69,498
Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale, amortized cost 27,927 43,067
Securities available for sale, gross unrealized gains 279 238
Securities available for sale, gross unrealized losses 53 221
Securities available for sale, fair value 28,153 43,084
US Government Agencies Debt Securities [Member]    
Securities available for sale, amortized cost 64,804 64,162
Securities available for sale, gross unrealized gains 1,300 473
Securities available for sale, gross unrealized losses 2 79
Securities available for sale, fair value 66,102 64,556
Municipal Notes [Member]    
Securities available for sale, amortized cost 96,848 74,606
Securities available for sale, gross unrealized gains 5,199 2,843
Securities available for sale, gross unrealized losses 34 25
Securities available for sale, fair value $ 102,013 $ 77,424