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Note 2 - INVESTMENT SECURITIES (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) item state issuer | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) state item issuer
Number of securities | item | 644 |  |
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions | item | 101 |  |
Aggregate losses of securities (as a percent) | 0.40% |  |
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | 8 |  |
Sale of securities | $ 19,500,000 | $ 0 |
Gain on sale | $ 0 |  |
Number Of Charters Owning Municipal Securities | item | 4 |  |
Revenue Bonds |  |  |
Number of issuers | issuer | 2 |  | 2
Percentage threshold | 5.00% |  | 5.00%
Municipal securities | General Obligation Bonds |  |  |
Number of issuers | item | 117 |  | 117
Other investments | $ 117,600,000 |  | $ 116,700,000
Number of states holding investments | state | 21 |  | 21
Municipal securities | General Obligation Bonds | Minimum |  |  |
Other investments | $ 5,000,000.0 |  | $ 5,000,000.0
Municipal securities | General Obligation Bonds | Aggregate Fair Value Exceeding 5 Million [Member] |  |  |
Number of states holding investments | state | 8 |  | 8
Municipal securities | Revenue Bonds |  |  |
Number of issuers | item | 192 |  | 191
Other investments | $ 535,300,000 |  | $ 555,900,000
Number of states holding investments | 26 |  | 26
Municipal securities | Revenue Bonds | Minimum |  |  |
Other investments | $ 5,000,000.0 |  | $ 5,000,000.0
Municipal securities | Revenue Bonds | Aggregate Fair Value Exceeding 5 Million [Member] |  |  |
Number of states holding investments | 13 |  | 12

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