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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 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Recurring Securities Available for Sale | $ 357,889 | $ 353,066
US Government Agencies Debt Securities [Member] |  |
Recurring Securities Available for Sale | 351,138 | 346,205
US States and Political Subdivisions Debt Securities [Member] |  |
Recurring Securities Available for Sale | 3,895 | 3,989
Corporate Debt Securities [Member] |  |
Recurring Securities Available for Sale | 2,856 | 2,872
Fair Value, Recurring [Member] |  |
Recurring Securities Available for Sale | 357,889 | 353,066
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 | 353,992 | 348,789
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Recurring Securities Available for Sale | 3,897 | 4,277
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |
Recurring Securities Available for Sale | 351,138 | 346,205
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Recurring Securities Available for Sale |  |
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Recurring Securities Available for Sale | 347,456 | 342,142
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Recurring Securities Available for Sale | 3,682 | 4,063
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Recurring Securities Available for Sale | 3,895 | 3,989
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Recurring Securities Available for Sale |  |
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Recurring Securities Available for Sale | 3,680 | 3,775
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Recurring Securities Available for Sale | 215 | 214
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Recurring Securities Available for Sale | 2,856 | 2,872
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Recurring Securities Available for Sale |  |
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Recurring Securities Available for Sale | 2,856 | 2,872
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Recurring Securities Available for Sale |  |
Fair Value, Nonrecurring [Member] |  |
Impaired Loans | 1,708 | 3,352
Other Real Estate | 1,123 | 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 | 1,708 | 3,352
Other Real Estate | $ 1,123 | $ 1,183

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