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Note 2 - Debt Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Securities available for sale, amortized cost	$ 165,049	$ 164,290
Securities available for sale, unrealized gains	1,204	2,266
Securities available for sale, unrealized losses	(2,116)	(1,031)
Securities available for sale, fair value	164,137	165,525	[1]
US Government Agencies Debt Securities [Member]
Securities available for sale, amortized cost	11,223	11,289
Securities available for sale, unrealized gains	11	17
Securities available for sale, unrealized losses	(10)	(10)
Securities available for sale, fair value	11,224	11,296
US Treasury Securities [Member]
Securities available for sale, amortized cost	19,947	19,987
Securities available for sale, unrealized gains
Securities available for sale, unrealized losses	(5)	(16)
Securities available for sale, fair value	19,942	19,971
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale, amortized cost	100,082	101,552
Securities available for sale, unrealized gains	1,152	2,203
Securities available for sale, unrealized losses	(895)	(107)
Securities available for sale, fair value	100,339	103,648
Single Issue Trust Preferred Securities [Member]
Securities available for sale, amortized cost	9,370	9,367
Securities available for sale, unrealized gains
Securities available for sale, unrealized losses	(379)	(483)
Securities available for sale, fair value	8,991	8,884
Mortgage-backed Agency Securities [Member]
Securities available for sale, amortized cost	24,427	22,095
Securities available for sale, unrealized gains	41	46
Securities available for sale, unrealized losses	(827)	(415)
Securities available for sale, fair value	$ 23,641	$ 21,726
[1] Derived from audited financial statements

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
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-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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