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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
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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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