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Note 3 - Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Due in one year or less, available for sale, amortized cost	$ 4,602
Due in one year or less, available for sale, fair value	4,593
Due in one year or less, held to maturity, amortized cost	89
Due in one year or less, held to maturity, fair value	89
Due in over one to five years, available for sale, amortized cost	6,025
Due in over one to five years, available for sale, fair value	5,996
Due in over one to five years, held to maturity, amortized cost	6,764
Due in over one to five years, held to maturity, fair value	7,000
Due in over five to ten years, available for sale, amortized cost	3,000
Due in over five to ten years, available for sale, fair value	2,990
Due in over five to ten years, held to maturity, amortized cost	8,055
Due in over five to ten years, held to maturity, fair value	8,482
Due after ten years, available for sale, amortized cost
Due after ten years, available for sale, fair value
Due after ten years, held to maturity, amortized cost	3,256
Due after ten years, held to maturity, fair value	3,247
Agency mortgage-backed securities, residential, available for sale, amortized cost	92,935
Agency mortgage-backed securities, residential, available for sale, fair value	92,966
Agency mortgage-backed securities, residential, held to maturity, amortized cost	4
Agency mortgage-backed securities, residential, held to maturity, fair value	4
Total debt securities, available for sale, amortized cost	106,562
Total debt securities, available for sale, fair value	106,545
Total debt securities, held to maturity, amortized cost	18,168	$ 18,665
Securities held to maturity	$ 18,822	$ 19,171

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Amount of held-to-maturity debt securities at fair value that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the fair value over several maturity groupings.

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Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, over several maturity groupings.

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Fair value of investments in debt securities classified as held-to-maturity.

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