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Note 13 - Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Available-for-sale debt securities | $ 164,137,000 | $ 165,525,000 | [1]
Derivative assets | 45,000 |  |
Derivative liabilities |  | 90,000 |
Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale debt securities | 164,137,000 | 165,525 |
Equity securities | 55,000 | 55,000 |
Fair value loans | 5,825,000 | 5,739,000 |
Deferred compensation assets | 4,070,000 | 4,002,000 |
Derivative assets | 45,000 |  |
Deferred compensation liabilities | 4,070,000 | 4,002,000 |
Derivative liabilities |  | 90,000 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Available-for-sale debt securities |  |  |
Equity securities | 55,000 | 55,000 |
Fair value loans |  |  |
Deferred compensation assets | 4,070,000 | 4,002,000 |
Derivative assets |  |  |
Deferred compensation liabilities | 4,070,000 | 4,002,000 |
Derivative liabilities |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Available-for-sale debt securities | 164,137,000 | 165,525 |
Equity securities |  |  |
Fair value loans |  | 5,739,000 |
Deferred compensation assets |  |  |
Derivative assets | 45,000 |  |
Deferred compensation liabilities |  |  |
Derivative liabilities |  | 90,000 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Available-for-sale debt securities |  |  |
Equity securities |  |  |
Fair value loans | 5,825,000 |  |
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 | 11,224,000 | 11,296,000 |
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 | 11,224,000 | 11,296,000 |
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 | 19,942,000 | 19,971,000 |
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 | 19,942,000 | 19,971,000 |
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 | 100,339,000 | 103,648,000 |
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 | 100,339,000 | 103,648,000 |
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] | Single Issue Trust Preferred Securities [Member] |  |  |
Available-for-sale debt securities | 8,991,000 | 8,884,000 |
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 | 8,991,000 | 8,884,000 |
Fair Value, Measurements, Recurring [Member] | Single Issue Trust Preferred 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 | 23,641,000 | 21,726,000 |
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 | 23,641,000 | 21,726,000 |
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Agency Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Available-for-sale debt securities |  |  |
[1] | Derived from audited financial statements

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