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Note 2 - Investment Securities - Available-for-sale Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Securities available-for-sale, amortized cost $ 49,075 $ 55,523
Securities available-for-sale, gross unrealized gains 149 404
Securities available-for-sale, gross unrealized losses (1,309) (583)
Securities available for sale, at fair value 47,915 55,344 [1]
US Government Agencies Debt Securities [Member]    
Securities available-for-sale, amortized cost 12,016 13,475
Securities available-for-sale, gross unrealized gains 18 61
Securities available-for-sale, gross unrealized losses (264) (101)
Securities available for sale, at fair value 11,770 13,435
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available-for-sale, amortized cost 21,277 24,344
Securities available-for-sale, gross unrealized gains 12
Securities available-for-sale, gross unrealized losses (843) (375)
Securities available for sale, at fair value 20,434 23,981
Corporate Debt Securities [Member]    
Securities available-for-sale, amortized cost 6,641 6,991
Securities available-for-sale, gross unrealized gains 31 118
Securities available-for-sale, gross unrealized losses (62) (42)
Securities available for sale, at fair value 6,610 7,067
US States and Political Subdivisions Debt Securities [Member]    
Securities available-for-sale, amortized cost 9,141 10,713
Securities available-for-sale, gross unrealized gains 100 213
Securities available-for-sale, gross unrealized losses (140) (65)
Securities available for sale, at fair value $ 9,101 $ 10,861
[1] Derived from consolidated audited financial statements.