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Note 19 - 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 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value | $ 347,332 | $ 353,066
Fair Value, Recurring [Member] |  |
Fair Value | 347,332 | 353,066
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value | 345,310 | 351,057
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value | 2,022 | 2,009
Fair Value, Nonrecurring [Member] |  |
Impaired loans | 5,985 | 3,352
Other real estate | 1,320 | 1,841
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 | 5,985 | 3,352
Other real estate | 1,320 | 1,841
US States and Political Subdivisions Debt Securities [Member] |  |
Fair Value | 5,115 | 3,989
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value | 5,115 | 3,989
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value |  |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value | 5,115 | 3,989
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value |  |
Corporate Debt Securities [Member] |  |
Fair Value | 2,806 | 2,872
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value | 2,806 | 2,872
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value |  |
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value | 784 | 863
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value | 2,022 | 2,009
US Government Agencies Debt Securities [Member] |  |
Fair Value | 339,411 | 346,205
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value | 339,411 | 346,205
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value |  |
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value | 339,411 | 346,205
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value |  |

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