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Note 2 - Investment Securities (Details) - Investment Securities in a Continuous Loss Position - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Note 2 - Investment Securities (Details) - Investment Securities in a Continuous Loss Position [Line Items]
Available-for-sale securities in continuous loss position, less than 12 months, fair value	$ 7,687	$ 7,817
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss	(18)	(88)
Available-for-sale securities in continuous loss position, 12 months or more, fair value	19,048	16,489
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss	(174)	(231)
Available-for-sale securities in continuous loss position, fair value	26,735	24,306
Available-for-sale securities in continuous loss position, unrealized loss	(192)	(319)
US Government Agencies Debt Securities [Member]
Note 2 - Investment Securities (Details) - Investment Securities in a Continuous Loss Position [Line Items]
Available-for-sale securities in continuous loss position, less than 12 months, fair value	4,989	4,954
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss	(11)	(46)
Available-for-sale securities in continuous loss position, 12 months or more, fair value		0
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss		0
Available-for-sale securities in continuous loss position, fair value	4,989	4,954
Available-for-sale securities in continuous loss position, unrealized loss	(11)	(46)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Note 2 - Investment Securities (Details) - Investment Securities in a Continuous Loss Position [Line Items]
Available-for-sale securities in continuous loss position, less than 12 months, fair value	2,698	2,863
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss	(7)	(42)
Available-for-sale securities in continuous loss position, 12 months or more, fair value	10,151	10,550
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss	(71)	(170)
Available-for-sale securities in continuous loss position, fair value	12,849	13,413
Available-for-sale securities in continuous loss position, unrealized loss	(78)	(212)
Corporate Debt Securities [Member]
Note 2 - Investment Securities (Details) - Investment Securities in a Continuous Loss Position [Line Items]
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	8,897	5,939
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss	(103)	(61)
Available-for-sale securities in continuous loss position, fair value	8,897	5,939
Available-for-sale securities in continuous loss position, unrealized loss	$ (103)	$ (61)

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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.

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