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Note 2 - INVESTMENT SECURITIES (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 USD ($) issuer item state | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) state issuer item
Number of securities | item | 649 |  |
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions | item | 286 |  |
Aggregate losses of securities (as a percent) | 3.07% |  |
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | item | 19 |  |
Number Of Charters Owning Municipal Securities | item | 4 |  |
Proceeds from sale of securities | $ | $ 0.0 | $ 19.5 |
Gains or losses from sale of securities | $ | $ 0.0 | $ 0.0 |
Revenue Bonds |  |  |
Number of issuers | issuer | 2 |  | 2
Percentage threshold | 5.00% |  | 5.00%
Municipal securities | General Obligation Bonds |  |  |
Number of issuers | item | 113 |  | 113
Other investments | $ | $ 112.5 |  | $ 114.5
Number of states holding investments | state | 22 |  | 20
Municipal securities | General Obligation Bonds | Minimum |  |  |
Other investments | $ | $ 5.0 |  | $ 5.0
Municipal securities | General Obligation Bonds | Aggregate Fair Value Exceeding 5 Million [Member] |  |  |
Number of states holding investments | state | 7 |  | 7
Municipal securities | Revenue Bonds |  |  |
Number of issuers | item | 174 |  | 165
Other investments | $ | $ 562.3 |  | $ 575.0
Number of states holding investments | 28 |  | 28
Municipal securities | Revenue Bonds | Minimum |  |  |
Other investments | $ | $ 5.0 |  | $ 5.0
Municipal securities | Revenue Bonds | Aggregate Fair Value Exceeding 5 Million [Member] |  |  |
Number of states holding investments | 14 |  | 13

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