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Note 2 - Investment Securities (Details) - Investment Securities in a Continuous Loss Position - USD ($) $ in Thousands	Jun. 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	$ 10,725
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss	(113)
Available-for-sale securities in continuous loss position, 12 months or more, fair value	17,835	$ 33,682
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss	(199)	(453)
Available-for-sale securities in continuous loss position, fair value	28,560	33,682
Available-for-sale securities in continuous loss position, unrealized loss	(312)	(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, less than 12 months, fair value	7,429
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss	(71)
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	7,429	7,409
Available-for-sale securities in continuous loss position, unrealized loss	(71)	(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	3,296
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss	(42)
Available-for-sale securities in continuous loss position, 12 months or more, fair value	11,879	17,337
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss	(155)	(298)
Available-for-sale securities in continuous loss position, fair value	15,175	17,337
Available-for-sale securities in continuous loss position, unrealized loss	(197)	(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	5,956	8,936
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss	(44)	(64)
Available-for-sale securities in continuous loss position, fair value	5,956	8,936
Available-for-sale securities in continuous loss position, unrealized loss	$ (44)	$ (64)

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