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Note 5 - Fair Value Measurements - Assets Measured on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Investment securities available for sale, at fair value | $ 100,028 | $ 95,283
US Government Agencies Debt Securities [Member] |  |
Investment securities available for sale, at fair value | 7,988 | 8,719
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Investment securities available for sale, at fair value | 16,643 | 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 | 100,684 | 95,283
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |
Investment securities available for sale, at fair value | 7,988 | 8,719
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Investment securities available for sale, at fair value | 75,397 | 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 | 16,643 | 18,510
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] |  |
Investment securities available for sale, at fair value | 100,028 | 94,658
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] |  |
Investment securities available for sale, at fair value | 656 | 625
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Investment securities available for sale, at fair value | 406 | 375
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 | 406 | 375
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Investment securities available for sale, at fair value | 100,278 | 94,908
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 | 7,988 | 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 | 75,397 | 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 | 16,643 | 18,510
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] |  |
Investment securities available for sale, at fair value | 100,028 | 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 | 250
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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