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Note 3 - Investment Securities (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) state security item | Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($)
Number of securities | security | 541 |  |
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions | security | 35 |  |
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 | 20 |  |
Other than temporary impairment losses, investments | $ | $ 0 | $ 0 | $ 0
Sale of securities | $ | 30,055 | 1,938 | 71,092
Gain on sale | $ | 176 |  | $ 67
Security Owned and Pledged as Collateral, Fair Value | $ | $ 113,300 | $ 100,900 |
Number of states holding investments | state | 50 |  |
Number Of Charters Owning Municipal Securities | item | 4 |  |
Municipal securities | General Obligation Bonds |  |  |
Number of issuers | item | 93 | 110 |
Other investments | $ | $ 77,200 | $ 86,400 |
Number of states holding investments | item | 22 | 26 |
Municipal securities | General Obligation Bonds | Aggregate Fair Value Exceeding 5 Million [Member] |  |  |
Number of states holding investments | item | 6 |  |
Municipal securities | Revenue Bonds |  |  |
Number of issuers | item | 154 | 160 |
Other investments | $ | $ 396,600 | $ 371,900 |
Number of states holding investments | item | 17 | 19 |
Revenue Bonds | Revenue Bonds | Minimum |  |  |
Other investments | $ | $ 5,000 | $ 5,000 |
Revenue Bonds | Revenue Bonds | Aggregate Fair Value Exceeding 5 Million [Member] |  |  |
Number of states holding investments | item | 7 | 7 |
General Obligation Bonds | General Obligation Bonds | Minimum |  |  |
Other investments | $ | $ 5,000 | $ 5,000 |
General Obligation Bonds | General Obligation Bonds | Aggregate Fair Value Exceeding 5 Million [Member] |  |  |
Number of states holding investments | item |  | 6 |

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