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Note 2 - INVESTMENT SECURITIES (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 USD ($) state issuer security | Mar. 31, 2023 USD ($) | Sep. 30, 2024 USD ($) state item issuer security | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) state issuer
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |  |  |  |
Number of securities | security | 662 |  | 662 |  |
Aggregate losses of securities (as a percent) | 7.20% |  | 7.20% |  |
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions | security | 498 |  | 498 |  |
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | security | 459 |  | 459 |  |
Securities trading, at fair value | $ 58,685 |  | $ 58,685 |  | $ 22,369
Recognized trading gain (loss) | $ (200) |  | $ 53 |  |
Number of charters owning municipal securities | item |  |  | 4 |  |
General Obligation Bonds |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |  |  |  |
Number of issuers | issuer | 79 |  | 79 |  | 82
Other investments | $ 106,800 |  | $ 106,800 |  | $ 99,400
Number of states holding investments | state | 17 |  | 17 |  | 18
General Obligation Bonds | Aggregate Fair Value Exceeding 5 Million |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |  |  |  |
Number of states holding investments | state | 9 |  | 9 |  | 8
General Obligation Bonds | Aggregate Fair Value Exceeding 5 Million | Minimum |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |  |  |  |
Other investments | $ 5,000 |  | $ 5,000 |  | $ 5,000
Revenue Bonds |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |  |  |  |
Number of issuers | issuer | 162 |  | 162 |  | 169
Other investments | $ 855,000 |  | $ 855,000 |  | $ 750,800
Number of states holding investments | state | 31 |  | 31 |  | 31
Revenue Bonds | Aggregate Fair Value Exceeding 5 Million |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |  |  |  |
Number of states holding investments | state | 13 |  | 13 |  | 15
Revenue Bonds | Aggregate Fair Value Exceeding 5 Million | Minimum |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |  |  |  |
Other investments | $ 5,000 |  | $ 5,000 |  | $ 5,000
Revenue Bonds | Aggregate Book Or Market Value Exceeded 5% of The Company Equity |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |  |  |  |
Number of issuers | issuer | 2 |  | 2 |  | 2
Percentage threshold | 5.00% |  | 5.00% |  |
Other securities |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |  |  |  |
Provision for credit loss expense |  |  |  | $ 989 |
Corporate securities |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |  |  |  |
Provision for credit loss expense |  | $ 989 | $ (445) |  |

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