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Note 18 - Fair Values of Financial Instruments - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Securities available-for-sale | $ 277,219 | $ 241,768
Fair Value, Recurring [Member] |  |
Securities available-for-sale | 277,219 | 241,768
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 9,670 | 2,480
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 266,473 | 237,239
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale | 1,076 | 2,049
Money Market Funds [Member] |  |
Securities available-for-sale | 9,670 | 2,480
Money Market Funds [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 9,670 | 2,480
Money Market Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 9,670 | 2,480
Money Market Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Money Market Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale | 13,058 |
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 13,058 | 7,894
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 13,058 | 7,894
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Collateralized Mortgage Obligations and Residential Mortgage Backed Securities [Member] |  |
Securities available-for-sale | 150,988 | 135,281
Collateralized Mortgage Obligations and Residential Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 150,988 | 135,281
Collateralized Mortgage Obligations and Residential Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Collateralized Mortgage Obligations and Residential Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 150,988 | 135,281
Collateralized Mortgage Obligations and Residential Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale | 102,427 | 94,064
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 102,427 | 94,064
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 102,427 | 94,064
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Collateralized Debt Obligations [Member] |  |
Securities available-for-sale | 1,076 | 2,049
Collateralized Debt Obligations [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 1,076 | 2,049
Collateralized Debt Obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Collateralized Debt Obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Collateralized Debt Obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale | $ 1,076 | $ 2,049

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