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Note 7 - Fair Value Measurements - Assets and Liabilities at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Securities available for sale | $ 337,211 | $ 331,387
Securities available for sale | 337,211 | 331,387
Fair Value, Inputs, Level 1 [Member] |  |
Securities available for sale | 0 |
Securities available for sale |  | 0
Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 337,211 |
Securities available for sale |  | 331,387
Fair Value, Inputs, Level 3 [Member] |  |
Securities available for sale | 0 |
Securities available for sale |  | 0
US Government Agencies Debt Securities [Member] |  |
Securities available for sale | 314,889 |
Securities available for sale | 314,889 | 307,719
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available for sale | 0 |
Securities available for sale |  | 0
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 314,889 |
Securities available for sale |  | 307,719
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available for sale | 0 |
Securities available for sale |  | 0
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale | 15,778 |
Securities available for sale | 15,778 | 16,834
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available for sale | 0 |
Securities available for sale |  | 0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 15,778 |
Securities available for sale |  | 16,834
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available for sale | 0 |
Securities available for sale |  | 0
Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale | 608 |
Securities available for sale | 608 | 659
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available for sale | 0 |
Securities available for sale |  | 0
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 608 |
Securities available for sale |  | 659
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available for sale | 0 |
Securities available for sale |  | 0
Corporate Debt Securities [Member] |  |
Securities available for sale | 5,936 |
Securities available for sale | 5,936 | 6,175
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available for sale | 0 |
Securities available for sale |  | 0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 5,936 |
Securities available for sale |  | 6,175
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available for sale | $ 0 |
Securities available for sale |  | $ 0

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