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Note 3 - Investment Securities (Details) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 16, 2023 USD ($) | Oct. 12, 2023 USD ($) | Dec. 31, 2023 USD ($) issuer state security item | Dec. 31, 2022 USD ($) state issuer
Securities trading, at fair value |  |  | $ 22,369 |
Sale of securities portfolio |  |  |  | $ 111,400
Number of securities | security |  |  | 657 |
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions | security |  |  | 493 |
Aggregate losses of securities (as a percent) |  |  | 8.22% |
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | security |  |  | 475 |
Gain on sale |  |  | $ 56 |
Number Of Charters Owning Municipal Securities | item |  |  | 4 |
Debt Securities, Available-for-Sale, Allowance for Credit Loss |  |  | $ 989 |
Amount of first loss support | $ 16,200 |  |  |
Trading securities |  |  | 22,369 |
Public deposits, FHLB advances, derivative liabilities |  |  |  |
Investment securities pledged |  |  | 117,800 | $ 47,000
Collateral Pledged |  |  |  |
Securities pledged |  |  | 10,100 |
Collateral Pledged | First loss support to Freddie Mac in conjunction with the M-series securitization |  |  |  |
Securities pledged |  |  | $ 16,200 |
General Obligation Bonds |  |  |  |
Number of issuers | issuer |  |  | 82 | 118
Other investments |  |  | $ 99,400 | $ 110,600
Number of states holding investments | state |  |  | 18 | 22
General Obligation Bonds | Aggregate Fair Value Exceeding 5 Million |  |  |  |
Number of states holding investments | state |  |  | 8 | 7
General Obligation Bonds | Aggregate Fair Value Exceeding 5 Million | Minimum |  |  |  |
Other investments |  |  | $ 5,000 | $ 5,000
Revenue Bonds |  |  |  |
Number of issuers | issuer |  |  | 169 | 181
Other investments |  |  | $ 750,800 | $ 617,200
Number of states holding investments | state |  |  | 31 | 29
Revenue Bonds | Aggregate Fair Value Exceeding 5 Million |  |  |  |
Number of states holding investments | state |  |  | 15 | 12
Revenue Bonds | Aggregate Fair Value Exceeding 5 Million | Minimum |  |  |  |
Other investments |  |  | $ 5,000 | $ 5,000
Revenue Bonds | Aggregate Book Or Market Value Exceeded 5% of The Company Equity [Member] |  |  |  |
Number of issuers | issuer |  |  | 2 | 2
Percentage threshold |  |  | 5.00% | 5.00%
Other securities |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss |  |  | $ 989 |
M-series Tax exempt LIHTC loans |  |  |  |
Securities trading, at fair value |  | $ 16,200 |  |
Securities pledged |  | 128,600 |  |
Trading securities |  | 16,200 |  |
Debt Securities, Trading, Realized Gain (Loss) |  | 2,400 |  |
Interest Only Strips, Class B Certificates | Collateral Pledged |  |  |  |
Amount of first loss support |  | $ 15,600 |  |
Percentage of first loss support |  | 12.00% |  |
Q-series Tax exempt LIHTC loans |  |  |  |
Securities trading, at fair value | 6,200 |  |  |
Securities pledged | 133,300 |  |  |
Trading securities | 6,200 |  |  |
Debt Securities, Trading, Realized Gain (Loss) | $ 3,100 |  |  |
Q-series Tax exempt LIHTC loans | Collateral Pledged |  |  |  |
Percentage of first loss support | 12.00% |  |  |

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