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Note 4 - Investment Securities (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Proceeds from Sale of Debt Securities, Available-for-Sale | $ 0 | $ 0 | $ 21,102
Debt Securities, Available-for-Sale, Realized Gain | 0 |  | 853
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 | 0
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 192 |  |
Pledged Investment Securities | $ 134,200 | 145,700 |
Equity Securities, FV-NI, Current | 40,406 | 22,158 |
Equity Securities, Net Realized Loss From Decrease in Fair Value | 18,200 | 291 | 1,400
Proceeds from Sale, Debt Security, Trading, and Equity Security, FV-NI, Held-for-Investment | $ 0 | 553 | $ 0
Equity Securities, FV-NI, Realized Gain (Loss) |  | $ (101) |
Collateralized Mortgage-Backed Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 154 | 159 |
Corporate Debt Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 24 | 22 |
US Treasury Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 1 | 6 |
Collateralized Mortgage Obligations [Member] |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 5 | 5 |
US Government Corporations and Agencies Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 8 | 3 |

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- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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