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Note 3 - Securities - Securities Available-for-sale (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Securities available for sale, amortized cost $ 106,304 $ 104,867
Securities available for sale, gross unrealized gains 1,043 100
Securities available for sale, gross unrealized losses (294) (2,803)
Securities available for sale 107,053 102,164
US Government-sponsored Enterprises Debt Securities [Member]    
Securities available for sale, amortized cost 16,679 16,837
Securities available for sale, gross unrealized gains 218 8
Securities available for sale, gross unrealized losses (16) (215)
Securities available for sale 16,881 16,630
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale, amortized cost 89,625 88,030
Securities available for sale, gross unrealized gains 825 92
Securities available for sale, gross unrealized losses (278) (2,588)
Securities available for sale $ 90,172 $ 85,534