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Note 3 - Investment Securities (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) item security | Dec. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($)
Number of securities | security | 622 |  |
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions | security | 42 |  |
Aggregate losses of securities (as a percent) | 0.17% |  |
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | security | 13 |  |
Sale of securities | $ | $ 23,874 | $ 38,562 | $ 30,055
Gain on sale | $ |  | 2,553 | $ 176
Security Owned and Pledged as Collateral, Fair Value | $ | $ 246,500 | $ 212,800 |
Number Of Charters Owning Municipal Securities | 4 |  |
Revenue Bonds |  |  |
Number of issuers | 2 |  |
Percentage threshold | 5.00% | 5.00% |
Municipal securities | General Obligation Bonds |  |  |
Number of issuers | 113 | 117 |
Other investments | $ | $ 114,500 | $ 116,700 |
Number of states holding investments | 20 | 21 |
Municipal securities | General Obligation Bonds | Minimum |  |  |
Other investments | $ | $ 5,000 | $ 5,000 |
Municipal securities | General Obligation Bonds | Aggregate Fair Value Exceeding 5 Million [Member] |  |  |
Number of states holding investments | 7 | 8 |
Municipal securities | Revenue Bonds |  |  |
Number of issuers | 165 | 191 |
Other investments | $ | $ 575,000 | $ 555,900 |
Number of states holding investments | 25 | 26 |
Municipal securities | Revenue Bonds | Minimum |  |  |
Other investments | $ | $ 5,000 | $ 5,000 |
Municipal securities | Revenue Bonds | Aggregate Fair Value Exceeding 5 Million [Member] |  |  |
Number of states holding investments | 13 | 12 |

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