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Note 3 - Available-for-sale Securities (Details) - Investment Securities in a Continuous Loss Position - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
2015
Available-for-sale securities in continuous loss position, less than 12 months, fair value	$ 7,817	$ 0
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss	(88)	0
Available-for-sale securities in continuous loss position, 12 months or more, fair value	16,489	33,682
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss	(231)	(453)
Available-for-sale securities in continuous loss position, fair value	24,306	33,682
Available-for-sale securities in continuous loss position, unrealized loss	(319)	(453)
US Government Agencies Debt Securities [Member]
2015
Available-for-sale securities in continuous loss position, less than 12 months, fair value	4,954	0
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss	(46)	0
Available-for-sale securities in continuous loss position, 12 months or more, fair value	0	7,409
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss	0	(91)
Available-for-sale securities in continuous loss position, fair value	4,954	7,409
Available-for-sale securities in continuous loss position, unrealized loss	(46)	(91)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
2015
Available-for-sale securities in continuous loss position, less than 12 months, fair value	2,863	0
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss	(42)	0
Available-for-sale securities in continuous loss position, 12 months or more, fair value	10,550	17,337
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss	(170)	(298)
Available-for-sale securities in continuous loss position, fair value	13,413	17,337
Available-for-sale securities in continuous loss position, unrealized loss	(212)	(298)
Corporate Debt Securities [Member]
2015
Available-for-sale securities in continuous loss position, less than 12 months, fair value	0	0
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss	0	0
Available-for-sale securities in continuous loss position, 12 months or more, fair value	5,939	8,936
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss	(61)	(64)
Available-for-sale securities in continuous loss position, fair value	5,939	8,936
Available-for-sale securities in continuous loss position, unrealized loss	$ (61)	$ (64)

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

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This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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+ References

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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

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+ References

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