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Note 2 - Investment Securities - Available-for-sale Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Securities available-for-sale, amortized cost $ 47,170 $ 55,523
Securities available-for-sale, gross unrealized gains 94 404
Securities available-for-sale, gross unrealized losses (1,560) (583)
Securities available for sale, at fair value 45,704 55,344 [1]
US Government Agencies Debt Securities [Member]    
Securities available-for-sale, amortized cost 11,130 13,475
Securities available-for-sale, gross unrealized gains 9 61
Securities available-for-sale, gross unrealized losses (339) (101)
Securities available for sale, at fair value 10,800 13,435
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available-for-sale, amortized cost 20,279 24,344
Securities available-for-sale, gross unrealized gains 12
Securities available-for-sale, gross unrealized losses (954) (375)
Securities available for sale, at fair value 19,325 23,981
Corporate Debt Securities [Member]    
Securities available-for-sale, amortized cost 6,641 6,991
Securities available-for-sale, gross unrealized gains 21 118
Securities available-for-sale, gross unrealized losses (74) (42)
Securities available for sale, at fair value 6,588 7,067
US States and Political Subdivisions Debt Securities [Member]    
Securities available-for-sale, amortized cost 9,120 10,713
Securities available-for-sale, gross unrealized gains 64 213
Securities available-for-sale, gross unrealized losses (193) (65)
Securities available for sale, at fair value $ 8,991 $ 10,861
[1] Derived from consolidated audited financial statements.