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Note 4 - Investment Securities (Details Textual) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Proceeds from Sale of Debt Securities, Available-for-Sale | $ 0 | $ 21,102 | $ 117,249
Debt Securities, Available-for-Sale, Realized Gain | $ 101 | 853 | 1,700
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 195 |  |
Pledged Investment Securities | $ 145,700 | 30,500 |
Equity Securities, FV-NI, Current | 22,158 | 22,319 |
Equity Securities, Net Realized Loss From Decrease in Fair Value | $ 291 | $ 1,400 | $ 1,100
Collateralized Mortgage-Backed Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 159 | 70 |
Corporate Debt Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 22 | 12 |
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 | 3 |
US Government Corporations and Agencies Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 3 | 3 |

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- Definition Amount of realized gain 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 -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27357-111563 + Details
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