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Note 8 - Investment Securities (Details Textual) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2023 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2022 USD ($)
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss |  | $ 6,300 |  | $ 6,300 |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) |  | 10,700 | $ 1,000 | 15,516 | $ 4,919 |
Equity Securities, FV-NI, Current |  | $ 37,674 |  | $ 37,674 |  | $ 22,158
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions |  | 203 |  | 203 |  | 195
Debt Securities, Available-for-Sale, Realized Loss | $ 3,000 |  |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss |  | $ 0 |  | $ 0 |  |
Debt Securities, Available-for-Sale, Transfer in, Allowance for Credit Loss, Expense |  | 0 |  | 0 |  |
Pledged Investment Securities |  | $ 235,100 |  | $ 235,100 |  | $ 145,700
Collateralized Mortgage-Backed Securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions |  | 159 |  | 159 |  | 159
Corporate Debt Securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions |  | 24 |  | 24 |  | 22
US Treasury Securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions |  |  |  |  |  | 6
Collateralized Mortgage Obligations [Member] |  |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions |  |  |  |  |  | 5
US Government Corporations and Agencies Securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions |  |  |  |  |  | 3

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