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Note 4 - Available-for-sale Securities - Investment Securities in a Continuous Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Available-for-sale securities in continuous loss position, less than 12 months, fair value	$ 16,955	$ 17,922
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss	(83)	(209)
Available-for-sale securities in continuous loss position, 12 months or more, fair value	17,047	3,106
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss	(1,206)	(93)
Available-for-sale securities in continuous loss position, fair value	34,002	21,028
Available-for-sale securities in continuous loss position, unrealized loss	(1,289)	(302)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale securities in continuous loss position, less than 12 months, fair value	16,955	4,118
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss	(83)	(13)
Available-for-sale securities in continuous loss position, 12 months or more, fair value	4,040	3,106
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss	(213)	(93)
Available-for-sale securities in continuous loss position, fair value	20,995	7,224
Available-for-sale securities in continuous loss position, unrealized loss	(296)	(106)
Corporate Debt Securities [Member]
Available-for-sale securities in continuous loss position, less than 12 months, fair value		13,804
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss		(196)
Available-for-sale securities in continuous loss position, 12 months or more, fair value	13,007
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss	(993)
Available-for-sale securities in continuous loss position, fair value	13,007	13,804
Available-for-sale securities in continuous loss position, unrealized loss	$ (993)	$ (196)

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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X

- Definition

Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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X

- Definition

Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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