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Note 11 - Fair Value of Financial Instruments and Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Recurring Securities Available for Sale | $ 409,839 | $ 353,066
Fair Value, Inputs, Level 1 [Member] |  |
Recurring Securities Available for Sale |  |
Fair Value, Inputs, Level 2 [Member] |  |
Recurring Securities Available for Sale |  | 348,789
Fair Value, Inputs, Level 3 [Member] |  |
Recurring Securities Available for Sale |  | 4,277
Fair Value, Recurring [Member] |  |
Recurring Securities Available for Sale | 409,839 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Recurring Securities Available for Sale |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Recurring Securities Available for Sale | 406,405 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Recurring Securities Available for Sale | 3,434 |
Fair Value, Nonrecurring [Member] |  |
Impaired Loans | 2,679 | 3,352
Other Real Estate | 714 | 1,183
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Impaired Loans |  |
Other Real Estate |  |
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Impaired Loans |  |
Other Real Estate |  |
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Impaired Loans | 2,679 | 3,352
Other Real Estate | 714 | 1,183
US Government Agencies Debt Securities [Member] |  |
Recurring Securities Available for Sale | 403,408 | 346,205
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Recurring Securities Available for Sale | 403,408 | 346,205
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Recurring Securities Available for Sale |  |
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Recurring Securities Available for Sale | 400,189 | 342,142
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Recurring Securities Available for Sale | 3,219 | 4,063
US States and Political Subdivisions Debt Securities [Member] |  |
Recurring Securities Available for Sale | 3,574 | 3,989
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Recurring Securities Available for Sale | 3,574 | 3,989
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Recurring Securities Available for Sale |  |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Recurring Securities Available for Sale | 3,359 | 3,775
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Recurring Securities Available for Sale | 215 | 214
Corporate Debt Securities [Member] |  |
Recurring Securities Available for Sale | 2,857 | 2,872
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Recurring Securities Available for Sale | 2,857 | 2,872
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Recurring Securities Available for Sale |  |
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Recurring Securities Available for Sale | 2,857 | 2,872
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Recurring Securities Available for Sale |  |

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