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Note 3 - Securities - Securities Held-to-maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Securities held to maturity, amortized cost	$ 17,219	$ 17,581
Securities held to maturity, gross unrecognized gains	460	533
Securities held to maturity, gross unrecognized losses	(141)	(35)
Securities held to maturity	17,538	18,079
US States and Political Subdivisions Debt Securities [Member]
Securities held to maturity, amortized cost	17,216	17,577
Securities held to maturity, gross unrecognized gains	460	533
Securities held to maturity, gross unrecognized losses	(141)	(35)
Securities held to maturity	17,535	18,075
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities held to maturity, amortized cost	3	4
Securities held to maturity, gross unrecognized gains
Securities held to maturity, gross unrecognized losses
Securities held to maturity	$ 3	$ 4

X

- Definition

Amount of accumulated unrecognized gain on 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 (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

X

- Definition

Amount of accumulated unrealized loss on 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 (c)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

+ Details

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X

- Definition

Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity).

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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X

- 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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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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