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Note 2 - Debt Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Available-for-sale debt securities
Securities available for sale, due within one year, amortized cost	$ 29,910
Securities available for sale, due within one year, fair value	29,888
Securities available for sale, due after one year but within five years, amortized cost	11,547
Securities available for sale, due after one year but within five years, fair value	11,644
Securities available for sale, due after five years but within ten years, amortized cost	86,662
Securities available for sale, due after five years but within ten years, fair value	86,226
Securities available for sale, due after ten years, amortized cost	785
Securities available for sale, due after ten years, fair value	782
Securities available for sale, single maturity date, amortized cost	128,904
Securities available for sale, single maturity date, fair value	128,540
Total debt securities available for sale, amortized cost	165,167
Total debt securities available for sale, fair value	163,593
Held-to-maturity debt securities
Securities held to maturity, due within one year, amortized cost	25,047
Securities held to maturity, due within one year, fair value	24,979
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	25,047	$ 25,149	[1]
Securities held to maturity, fair value	24,979	$ 25,084
Collateralized Mortgage Backed Securities [Member]
Available-for-sale debt securities
Securities available for sale, no single maturity date, amortized cost	36,263
Securities available for sale, no single maturity date, fair value	$ 35,053
[1] Derived from audited financial statements

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Amount of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (f)(1)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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