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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, 2020 | Dec. 31, 2019
--- | --- | ---
Securities available-for-sale | $ 410,669 | $ 277,219
Fair Value, Recurring [Member] |  |
Securities available-for-sale | 410,669 | 277,219
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 52,941 | 9,670
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 356,799 | 266,473
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale | 929 | 1,076
Money Market Funds [Member] |  |
Securities available-for-sale | 52,941 | 9,670
Money Market Funds [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 52,941 | 9,670
Money Market Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 52,941 | 9,670
Money Market Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 0 | 0
Money Market Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale | 0 | 0
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale | 7,860 |
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 7,860 | 13,058
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 0 | 0
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 7,860 | 13,058
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale | 0 | 0
Collateralized Mortgage Obligations and Residential Mortgage Backed Securities [Member] |  |
Securities available-for-sale | 154,736 | 150,988
Collateralized Mortgage Obligations and Residential Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 154,736 | 150,988
Collateralized Mortgage Obligations and Residential Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 0 | 0
Collateralized Mortgage Obligations and Residential Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 154,736 | 150,988
Collateralized Mortgage Obligations and Residential Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale | 0 | 0
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale | 194,203 | 102,427
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 194,203 | 102,427
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 0 | 0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 194,203 | 102,427
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale | 0 | 0
Collateralized Debt Obligations [Member] |  |
Securities available-for-sale | 929 | 1,076
Collateralized Debt Obligations [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 929 | 1,076
Collateralized Debt Obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 0 | 0
Collateralized Debt Obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 0 | 0
Collateralized Debt Obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale | $ 929 | $ 1,076

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