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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
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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 | $ 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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