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Note 5 - Fair Value Measurements - Assets Measured on a Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Investment securities available for sale, at fair value | $ 91,262 | $ 95,283
US Government Agencies Debt Securities [Member] |  |
Investment securities available for sale, at fair value | 8,305 | 8,719
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Investment securities available for sale, at fair value | 17,378 | 18,510
Debt Securities [Member] |  |
Investment securities available for sale, at fair value |  | 94,658
Equity Securities [Member] |  |
Investment securities available for sale, at fair value |  | 625
Fair Value, Measurements, Recurring [Member] |  |
Investment securities available for sale, at fair value | 91,905 | 95,283
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |
Investment securities available for sale, at fair value | 8,305 | 8,719
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Investment securities available for sale, at fair value | 65,579 | 67,429
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Investment securities available for sale, at fair value | 17,378 | 18,510
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] |  |
Investment securities available for sale, at fair value | 91,262 | 94,658
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] |  |
Investment securities available for sale, at fair value | 643 | 625
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Investment securities available for sale, at fair value | 393 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |
Investment securities available for sale, at fair value |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Investment securities available for sale, at fair value |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Investment securities available for sale, at fair value |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] |  |
Investment securities available for sale, at fair value |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] |  |
Investment securities available for sale, at fair value | 393 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Investment securities available for sale, at fair value | 91,512 | 95,283
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |
Investment securities available for sale, at fair value | 8,305 | 8,719
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Investment securities available for sale, at fair value | 65,579 | 67,429
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Investment securities available for sale, at fair value | 17,378 | 18,510
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] |  |
Investment securities available for sale, at fair value | 91,262 | 94,658
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] |  |
Investment securities available for sale, at fair value | 250 | 625
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Investment securities available for sale, at fair value |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |
Investment securities available for sale, at fair value |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Investment securities available for sale, at fair value |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Investment securities available for sale, at fair value |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] |  |
Investment securities available for sale, at fair value |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] |  |
Investment securities available for sale, at fair value |  |

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