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Note 3 - Available-for-sale Securities - Investment Securities in a Continuous Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Available-for-sale securities in continuous loss position, less than 12 months, fair value	$ 11,406	$ 17,922
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss	(412)	(209)
Available-for-sale securities in continuous loss position, 12 months or more, fair value	8,850	3,106
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss	(186)	(93)
Available-for-sale securities in continuous loss position, fair value	20,256	21,028
Available-for-sale securities in continuous loss position, unrealized loss	(598)	(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	3,755	4,118
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss	(63)	(13)
Available-for-sale securities in continuous loss position, 12 months or more, fair value	2,900	3,106
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss	(136)	(93)
Available-for-sale securities in continuous loss position, fair value	6,655	7,224
Available-for-sale securities in continuous loss position, unrealized loss	(199)	(106)
Corporate Debt Securities [Member]
Available-for-sale securities in continuous loss position, less than 12 months, fair value	7,651	13,804
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss	(349)	(196)
Available-for-sale securities in continuous loss position, 12 months or more, fair value	5,950
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss	(50)
Available-for-sale securities in continuous loss position, fair value	13,601	13,804
Available-for-sale securities in continuous loss position, unrealized loss	$ (399)	$ (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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- 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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