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Note 2 - Securities (Details) - Securities Available-for-Sale with Unrealized Losses - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Note 2 - Securities (Details) - Securities Available-for-Sale with Unrealized Losses [Line Items] |  |
Less than 12 Months - Fair Value | $ 50,076 | $ 11,232
Less than 12 Months - Unrealized Loss | (453) | (20)
Fair Value | 53,721 | 27,540
Unrealized Loss | (519) | (240)
12 Months or More - Fair Value | 3,645 | 16,308
12 Months or More - Unrealized Loss | (66) | (220)
US Government-sponsored Enterprises Debt Securities [Member] |  |
Note 2 - Securities (Details) - Securities Available-for-Sale with Unrealized Losses [Line Items] |  |
Less than 12 Months - Fair Value | 7,964 | 0
Less than 12 Months - Unrealized Loss | (46) | 0
Fair Value | 7,964 | 7,911
Unrealized Loss | (46) | (104)
12 Months or More - Fair Value | 0 | 7,911
12 Months or More - Unrealized Loss | 0 | (104)
Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |
Note 2 - Securities (Details) - Securities Available-for-Sale with Unrealized Losses [Line Items] |  |
Less than 12 Months - Fair Value | 42,112 | 11,232
Less than 12 Months - Unrealized Loss | (407) | (20)
Fair Value | 45,757 | 19,629
Unrealized Loss | (473) | (136)
12 Months or More - Fair Value | 3,645 | 8,397
12 Months or More - Unrealized Loss | $ (66) | $ (116)

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