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Note 2 - Debt Securities - Securities Available-for-sale (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Securities available for sale, amortized cost $ 165,167 $ 164,290
Securities available for sale, unrealized gains 785 2,266
Securities available for sale, unrealized losses (2,359) (1,031)
Securities available for sale, fair value 163,593 165,525 [1]
US Government Agencies Debt Securities [Member]    
Securities available for sale, amortized cost 1,137 11,289
Securities available for sale, unrealized gains 4 17
Securities available for sale, unrealized losses (10)
Securities available for sale, fair value 1,141 11,296
US Treasury Securities [Member]    
Securities available for sale, amortized cost 29,910 19,987
Securities available for sale, unrealized gains
Securities available for sale, unrealized losses (22) (16)
Securities available for sale, fair value 29,888 19,971
US States and Political Subdivisions Debt Securities [Member]    
Securities available for sale, amortized cost 97,857 101,552
Securities available for sale, unrealized gains 766 2,203
Securities available for sale, unrealized losses (1,112) (107)
Securities available for sale, fair value 97,511 103,648
Mortgage-backed Agency Securities [Member]    
Securities available for sale, amortized cost 36,263 22,095
Securities available for sale, unrealized gains 15 46
Securities available for sale, unrealized losses (1,225) (415)
Securities available for sale, fair value $ 35,053 21,726
Single Issue Trust Preferred Securities [Member]    
Securities available for sale, amortized cost   9,367
Securities available for sale, unrealized gains  
Securities available for sale, unrealized losses   (483)
Securities available for sale, fair value   $ 8,884
[1] Derived from audited financial statements