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Note 20 - Subsequent Event | 9 Months Ended
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Sep. 30, 2025
Notes to Financial Statements |
Subsequent Events [Text Block] | Subsequent event: On October 22, 2025, the Company announced the signing of a definitive merger agreement (the "Merger Agreement") with Middlefield Banc Corp. ("Middlefield"), the holding company for The Middlefield Banking Company ("Middlefield Bank"), where Middlefield will merge with and into the Company in an all-stock transaction ("the Merger"). Pursuant to the Merger Agreement, each share of Middlefield common stock outstanding immediately prior to completion of the merger will be converted into the right to receive 2.6 shares of the Company's common stock. Based on the Company's closing share price of $13.91 on October 20, 2025, the proposed transaction is valued at approximately $299.0 million, or $36.17 per Middlefield common share. The merger is expected to qualify as a tax-free reorganization. The transaction is subject to receipt of Middlefield and the Company's shareholder approvals and customary regulatory approvals. The transaction is expected to close in the first quarter of 2026.

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- Definition The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 855 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/855/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 855 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483399/855-10-50-2 + Details
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