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Note 2 - Debt Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Securities available for sale, due within one year, amortized cost	$ 29,974
Securities available for sale, due within one year, fair value	29,959
Securities available for sale, due after one year but within five years, amortized cost	7,563
Securities available for sale, due after one year but within five years, fair value	7,646
Securities available for sale, due after five years but within ten years, amortized cost	99,038
Securities available for sale, due after five years but within ten years, fair value	98,852
Securities available for sale, due after ten years, amortized cost	4,047
Securities available for sale, due after ten years, fair value	4,039
Securities available for sale, single maturity date, amortized cost	140,622
Securities available for sale, single maturity date, fair value	140,496
Total debt securities available for sale, amortized cost	165,049
Total debt securities available for sale, fair value	164,137
Securities held to maturity, due within one year, amortized cost
Securities held to maturity, due within one year, fair value
Securities held to maturity, due after one year but within five years, amortized cost	25,115
Securities held to maturity, due after one year but within five years, fair value	24,987
Securities held to maturity, due after five years but within ten years, amortized cost
Securities held to maturity, due after five years but within ten years, fair value
Securities held to maturity, due after ten years, amortized cost
Securities held to maturity, due after ten years, fair value
Total debt securities held to maturity, amortized cost	25,115	$ 25,149	[1]
Total debt securities held to maturity, fair value	24,987	$ 25,084
Collateralized Mortgage Backed Securities [Member]
Securities available for sale, no single maturity date, amortized cost	24,427
Securities available for sale, no single maturity date, fair value	$ 23,641
[1] Derived from audited financial statements

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