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Note 2 - Debt Securities - Held to Maturity Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Securities held to maturity, less than 12 months fair value	$ 24,987	$ 25,084
Securities held to maturity, less than 12 months unrealized losses	(128)	(65)
Securities held to maturity, 12 months or longer fair value
Securities held to maturity, 12 months or longer unrealized losses
Securities held to maturity, total fair value	24,987	25,084
Securities held to maturity, unrealized losses	(128)	(65)
US Government Agencies Debt Securities [Member]
Securities held to maturity, less than 12 months fair value	17,838	17,888
Securities held to maturity, less than 12 months unrealized losses	(87)	(49)
Securities held to maturity, 12 months or longer fair value
Securities held to maturity, 12 months or longer unrealized losses
Securities held to maturity, total fair value	17,838	17,888
Securities held to maturity, unrealized losses	(87)	(49)
Corporate Debt Securities [Member]
Securities held to maturity, less than 12 months fair value	7,149	7,196
Securities held to maturity, less than 12 months unrealized losses	(41)	(16)
Securities held to maturity, 12 months or longer fair value
Securities held to maturity, 12 months or longer unrealized losses
Securities held to maturity, total fair value	7,149	7,196
Securities held to maturity, unrealized losses	$ (41)	$ (16)

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)
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- Definition

Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for 12 months or longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 320
-SubTopic 10
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- Definition

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

+ References

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-Publisher FASB
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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for less than 12 months.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 320
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Fair value of investment in debt security measured at amortized cost (held-to-maturity), in continuous unrealized loss position for less than 12 months.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), in continuous unrealized loss position for 12 months or longer.

+ References

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-Topic 320
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