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Note 2 - Debt Securities - Securities Available-for-sale (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Securities available for sale, amortized cost $ 197,634 $ 164,290
Securities available for sale, unrealized gains 1,101 2,266
Securities available for sale, unrealized losses (2,310) (1,031)
Securities available for sale, fair value 196,425 165,525 [1]
US Government Agencies Debt Securities [Member]    
Securities available for sale, amortized cost 1,166 11,289
Securities available for sale, unrealized gains 4 17
Securities available for sale, unrealized losses (10)
Securities available for sale, fair value 1,170 11,296
US Treasury Securities [Member]    
Securities available for sale, amortized cost 49,827 19,987
Securities available for sale, unrealized gains
Securities available for sale, unrealized losses (19) (16)
Securities available for sale, fair value 49,808 19,971
US States and Political Subdivisions Debt Securities [Member]    
Securities available for sale, amortized cost 99,451 101,552
Securities available for sale, unrealized gains 1,063 2,203
Securities available for sale, unrealized losses (909) (107)
Securities available for sale, fair value 99,605 103,648
Single Issue Trust Preferred Securities [Member]    
Securities available for sale, amortized cost 9,374 9,367
Securities available for sale, unrealized gains
Securities available for sale, unrealized losses (391) (483)
Securities available for sale, fair value 8,983 8,884
Mortgage-backed Agency Securities [Member]    
Securities available for sale, amortized cost 37,816 22,095
Securities available for sale, unrealized gains 34 46
Securities available for sale, unrealized losses (991) (415)
Securities available for sale, fair value $ 36,859 $ 21,726
[1] Derived from audited financial statements