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Note 2 - Debt Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Securities available for sale, due within one year, amortized cost	$ 49,827
Securities available for sale, due within one year, fair value	49,808
Securities available for sale, due after one year but within five years, amortized cost	9,902
Securities available for sale, due after one year but within five years, fair value	10,014
Securities available for sale, due after five years but within ten years, amortized cost	97,955
Securities available for sale, due after five years but within ten years, fair value	97,590
Securities available for sale, due after ten years, amortized cost	2,134
Securities available for sale, due after ten years, fair value	2,154
Securities available for sale, single maturity date, amortized cost	159,818
Securities available for sale, single maturity date, fair value	159,566
Total debt securities available for sale, amortized cost	197,634
Total debt securities available for sale, fair value	196,425
Securities held to maturity, due within one year, amortized cost	25,082
Securities held to maturity, due within one year, fair value	24,980
Securities held to maturity, due after one year but within five years, amortized cost
Securities held to maturity, due after one year but within five years, fair value
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
Securities held to maturity, amortized cost	25,082	$ 25,149	[1]
Securities held to maturity, fair value	24,980	$ 25,084
Collateralized Mortgage Backed Securities [Member]
Securities available for sale, no single maturity date, amortized cost	37,816
Securities available for sale, no single maturity date, fair value	$ 36,859
[1] Derived from audited financial statements

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