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Note 3 - Investment Securities (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) security item state | Dec. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($)
Number of securities | security | 668 |  |
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions | security | 41 |  |
Aggregate losses of securities (as a percent) | 0.10% |  |
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | security | 5 |  |
Other than temporary impairment losses, investments | $ | $ 0 | $ 0 | $ 0
Sale of securities | $ | 38,562 | 30,055 | $ 1,938
Gain on sale | $ | 2,553 | 176 |
Security Owned and Pledged as Collateral, Fair Value | $ | $ 212,800 | $ 113,400 |
Number of states holding investments | state | 50 |  |
Number Of Charters Owning Municipal Securities | item | 4 |  |
Revenue Bonds |  |  |
Number of issuers | item | 2 | 1 |
Percentage threshold | 5.00% | 5.00% |
Municipal securities | General Obligation Bonds |  |  |
Number of issuers | item | 117 | 93 |
Other investments | $ | $ 116,700 | $ 77,200 |
Number of states holding investments | item | 21 | 22 |
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 | item | 8 | 6 |
Municipal securities | Revenue Bonds |  |  |
Number of issuers | item | 191 | 154 |
Other investments | $ | $ 555,900 | $ 396,600 |
Number of states holding investments | item | 26 | 17 |
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 | item | 12 | 7 |

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