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Note 6 - Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Equity securities, at fair value (Note 2) | $ 8,282 | $ 8,492
Securities available for sale, at fair value (Note 2) | 641,048 | 1,098,885
US Treasury and Government [Member] |  |
Securities available for sale, at fair value (Note 2) | 0 | 2,008
US Treasury Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 86,491 | 91,979
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 312,388 | 534,847
Collateralized Mortgage-Backed Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 226,669 | 433,115
Corporate Debt Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 1,255 | 20,642
Asset-Backed Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 14,245 | 16,294
Fair Value, Recurring [Member] |  |
Securities available for sale, at fair value (Note 2) | 641,048 | 1,098,885
Fair Value, Recurring [Member] | Equity Securities [Member] |  |
Equity securities, at fair value (Note 2) | 8,282 | 8,492
Fair Value, Recurring [Member] | US Treasury and Government [Member] |  |
Securities available for sale, at fair value (Note 2) | 0 | 2,008
Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 86,491 | 91,979
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 312,388 | 534,847
Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 226,669 | 433,115
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 1,255 | 20,642
Fair Value, Recurring [Member] | Asset-Backed Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 14,245 | 16,294
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Securities available for sale, at fair value (Note 2) | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member] |  |
Equity securities, at fair value (Note 2) | 6,515 | 6,724
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member] |  |
Securities available for sale, at fair value (Note 2) | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Asset-Backed Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Securities available for sale, at fair value (Note 2) | 641,048 | 1,077,835
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member] |  |
Equity securities, at fair value (Note 2) | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member] |  |
Securities available for sale, at fair value (Note 2) | 0 | 2,008
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 86,491 | 91,979
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 312,388 | 514,797
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 226,669 | 433,115
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 1,255 | 19,642
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Asset-Backed Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 14,245 | 16,294
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Securities available for sale, at fair value (Note 2) | 0 | 21,050
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member] |  |
Equity securities, at fair value (Note 2) | 1,767 | 1,768
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member] |  |
Securities available for sale, at fair value (Note 2) | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 0 | 20,050
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 0 | 1,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Asset-Backed Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | $ 0 | $ 0

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