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Note 3 - Investment Securities - Investment Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Securities available for sale, amortized cost $ 274,709 $ 251,819
Securities available for sale, gross unrealized gains 8,830 3,644
Securities available for sale, gross unrealized losses 37 901
Securities available for sale, fair value 283,502 254,562
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale, amortized cost 59,997 69,984
Securities available for sale, gross unrealized gains 1,362 90
Securities available for sale, gross unrealized losses 0 576
Securities available for sale, fair value 61,359 69,498
Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale, amortized cost 20,842 43,067
Securities available for sale, gross unrealized gains 218 238
Securities available for sale, gross unrealized losses 30 221
Securities available for sale, fair value 21,030 43,084
US Government Agencies Debt Securities [Member]    
Securities available for sale, amortized cost 80,359 64,162
Securities available for sale, gross unrealized gains 1,175 473
Securities available for sale, gross unrealized losses 3 79
Securities available for sale, fair value 81,531 64,556
Municipal Notes [Member]    
Securities available for sale, amortized cost 113,511 74,606
Securities available for sale, gross unrealized gains 6,075 2,843
Securities available for sale, gross unrealized losses 4 25
Securities available for sale, fair value $ 119,582 $ 77,424