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Note 6 - Fair Value Measurements - Assets and Liabilities at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Securities available for sale | $ 641,486 | $ 546,742
Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 641,486 | 546,742
US Government Agencies Debt Securities [Member] |  |
Securities available for sale | 220,191 | 91,163
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 220,191 | 91,163
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale | 199,307 | 203,961
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 199,307 | 203,961
Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale | 218,752 | 249,175
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 218,752 | 249,175
Corporate Debt Securities [Member] |  |
Securities available for sale | 3,236 | 2,443
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | $ 3,236 | $ 2,443

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