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Note 2 - Investment Securities (Details) - Investment Securities in a Continuous Loss Position - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
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	$ 3,070
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss	(16)
Available-for-sale securities in continuous loss position, 12 months or more, fair value	17,071	$ 33,682
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss	(172)	(453)
Available-for-sale securities in continuous loss position, fair value	20,141	33,682
Available-for-sale securities in continuous loss position, unrealized loss	(188)	(453)
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, 12 months or more, fair value		7,409
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss		(91)
Available-for-sale securities in continuous loss position, fair value		7,409
Available-for-sale securities in continuous loss position, unrealized loss		(91)
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	3,070
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss	(16)
Available-for-sale securities in continuous loss position, 12 months or more, fair value	11,132	17,337
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss	(111)	(298)
Available-for-sale securities in continuous loss position, fair value	14,202	17,337
Available-for-sale securities in continuous loss position, unrealized loss	(127)	(298)
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, 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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