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Note 5 - Investments' Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Residential Mortgage Backed Securities [Member]
Available-for-Sale, Less than 12 Months, Fair Value	$ 44,994	$ 83,403
Available-for-Sale, Less than 12 Months, Unrealized Losses	(128)	(458)
Available-for-Sale, 12 Months or More, Fair Value	5,321	9,061
Available-for-Sale, 12 Months or More, Unrealized Losses	(44)	(150)
Commercial Mortgage Backed Securities [Member]
Available-for-Sale, Less than 12 Months, Fair Value	24,822	24,337
Available-for-Sale, Less than 12 Months, Unrealized Losses	(107)	(272)
Available-for-Sale, 12 Months or More, Fair Value	13,515	8,918
Available-for-Sale, 12 Months or More, Unrealized Losses	(442)	(344)
Held-to-Maturity, Less than 12 Months, Fair Value	13,557	14,143
Held-to-Maturity, Less than 12 Months, Unrealized Losses	$ (56)	$ (170)
Held-to-Maturity, 12 Months or More, Fair Value
Held-to-Maturity, 12 Months or More, Unrealized Losses
US Government Agencies Debt Securities [Member]
Available-for-Sale, Less than 12 Months, Fair Value	$ 1,996	$ 1,982
Available-for-Sale, Less than 12 Months, Unrealized Losses	$ (4)	$ (17)
Available-for-Sale, 12 Months or More, Fair Value
Available-for-Sale, 12 Months or More, Unrealized Losses
Held-to-Maturity, Less than 12 Months, Fair Value	$ 1,579	$ 11,163
Held-to-Maturity, Less than 12 Months, Unrealized Losses	$ (8)	(44)
Held-to-Maturity, 12 Months or More, Fair Value		1,560
Held-to-Maturity, 12 Months or More, Unrealized Losses		(27)
US States and Political Subdivisions Debt Securities [Member]
Available-for-Sale, Less than 12 Months, Fair Value	$ 446	707
Available-for-Sale, Less than 12 Months, Unrealized Losses	$ (1)	$ (4)
Available-for-Sale, 12 Months or More, Fair Value
Available-for-Sale, 12 Months or More, Unrealized Losses
Held-to-Maturity, Less than 12 Months, Fair Value	$ 572	$ 572
Held-to-Maturity, Less than 12 Months, Unrealized Losses	$ (1)	$ (4)
Held-to-Maturity, 12 Months or More, Fair Value
Held-to-Maturity, 12 Months or More, Unrealized Losses
Corporate Debt Securities [Member]
Available-for-Sale, Less than 12 Months, Fair Value	$ 766	$ 779
Available-for-Sale, Less than 12 Months, Unrealized Losses	$ (8)
Available-for-Sale, 12 Months or More, Fair Value
Available-for-Sale, 12 Months or More, Unrealized Losses
Available-for-Sale, Less than 12 Months, Fair Value	$ 73,024	$ 111,208
Available-for-Sale, Less than 12 Months, Unrealized Losses	(248)	(751)
Available-for-Sale, 12 Months or More, Fair Value	18,836	17,979
Available-for-Sale, 12 Months or More, Unrealized Losses	(486)	(494)
Held-to-Maturity, Less than 12 Months, Fair Value	15,708	25,878
Held-to-Maturity, Less than 12 Months, Unrealized Losses	$ (65)	(218)
Held-to-Maturity, 12 Months or More, Fair Value		1,560
Held-to-Maturity, 12 Months or More, Unrealized Losses		$ (27)

X

- Definition

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=73527792&loc=d3e27290-111563

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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 less than twelve months.

+ 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=73527792&loc=d3e27290-111563

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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 7
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

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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)(1)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

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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 7
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

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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 7
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

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-Publisher FASB
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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)(1)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

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