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Note 13 - Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Available-for-sale debt securities | $ 163,593 | $ 165,525 | [1]
Derivative assets | 145 |  |
Derivative liabilities |  | 90 |
Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale debt securities | 163,593 | 165,525 |
Equity securities | 55 | 55 |
Fair value loans | 5,730 | 5,739 |
Deferred compensation assets | 3,779 | 4,002 |
Derivative assets | 145 |  |
Deferred compensation liabilities | 3,779 | 4,002 |
Derivative liabilities |  | 90 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Available-for-sale debt securities |  |  |
Equity securities | 55 | 55 |
Fair value loans |  |  |
Deferred compensation assets | 3,779 | 4,002 |
Derivative assets |  |  |
Deferred compensation liabilities | 3,779 | 4,002 |
Derivative liabilities |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Available-for-sale debt securities | 163,593 | 165,525 |
Equity securities |  |  |
Fair value loans |  | 5,739 |
Deferred compensation assets |  |  |
Derivative assets | 145 |  |
Deferred compensation liabilities |  |  |
Derivative liabilities |  | 90 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Available-for-sale debt securities |  |  |
Equity securities |  |  |
Fair value loans | 5,730 |  |
Deferred compensation assets |  |  |
Derivative assets |  |  |
Deferred compensation liabilities |  |  |
Derivative liabilities |  |  |
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |  |
Available-for-sale debt securities | 1,141 | 11,296 |
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Available-for-sale debt securities |  |  |
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Available-for-sale debt securities | 1,141 | 11,296 |
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Available-for-sale debt securities |  |  |
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member] |  |  |
Available-for-sale debt securities | 29,888 | 19,971 |
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Available-for-sale debt securities |  |  |
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Available-for-sale debt securities | 29,888 | 19,971 |
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Available-for-sale debt securities |  |  |
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Available-for-sale debt securities | 97,511 | 103,648 |
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Available-for-sale debt securities |  |  |
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Available-for-sale debt securities | 97,511 | 103,648 |
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Available-for-sale debt securities |  |  |
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Agency Securities [Member] |  |  |
Available-for-sale debt securities | 35,053 | 21,726 |
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Agency Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Available-for-sale debt securities |  |  |
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Agency Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Available-for-sale debt securities | 35,053 | 21,726 |
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Agency Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Available-for-sale debt securities |  |  |
Fair Value, Measurements, Recurring [Member] | Single Issue Trust Preferred Securities [Member] |  |  |
Available-for-sale debt securities |  | 8,884 |
Fair Value, Measurements, Recurring [Member] | Single Issue Trust Preferred Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Available-for-sale debt securities |  |  |
Fair Value, Measurements, Recurring [Member] | Single Issue Trust Preferred Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Available-for-sale debt securities |  | 8,884 |
Fair Value, Measurements, Recurring [Member] | Single Issue Trust Preferred Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Available-for-sale debt securities |  |  |
[1] | Derived from audited financial statements

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