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Significant Accounting Policies (Policies) | 9 Months Ended
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Sep. 30, 2025
Accounting Policies [Abstract] |
Basis of Accounting, Policy [Policy Text Block] | Principles of Consolidation and Basis of Presentation The consolidated financial statements of Middlefield Banc Corp. ("Company") include its bank subsidiary, The Middlefield Banking Company (“MBC” or “Bank”), and a nonbank asset resolution subsidiary EMORECO, Inc. The consolidated financial statements also include the accounts of MBC’s subsidiaries, Middlefield Investments, Inc. (“MI”) and MB Insurance Services (“MIS”). All significant inter-company items have been eliminated. On March 13, 2019, MBC established MI as an operating subsidiary to hold and manage an investment portfolio. On September 30, 2025, MI’s assets consist of a cash account, available-for-sale investment securities, and related accrued interest accounts. MI may only hold and manage investments and may not engage in any other activity without prior approval of the Ohio Division of Financial Institutions. In the first quarter of 2022, MBC established MIS as an operating subsidiary to offer retail and business customers various insurance services, including home, renters, automobile, pet, identity theft, travel, and professional liability insurance. On September 30, 2025, MIS assets consist of a cash account, a prepaid asset, and an accounts receivable. As a result of the bank merger of Liberty National Bank and MBC on December 1, 2022, Middlefield Banc Corp. acquired a 100% ownership interest in LBSI Insurance, LLC (“LBSI”), a wholly owned financial subsidiary of Liberty National Bank. LBSI did not operate after the merger, and its existence ended January 19, 2024. All significant intercompany items have been eliminated between MBC and these subsidiaries. The unaudited consolidated financial statements have been prepared in conformity with the instructions to Form 10-Q and Article 10 of Regulation SX. Accordingly, they do not include all of the information and footnotes required by U.S. generally accepted accounting principles (“GAAP”) for complete financial statements. The financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Form 10-K for the year ended December 31, 2024. The interim consolidated financial statements include all adjustments (consisting of only normal recurring items) that, in the opinion of management, are necessary for a fair presentation of the financial position and results of operations for the periods presented. The results of operations for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for a full year.
New Accounting Pronouncements, Policy [Policy Text Block] | Accounting Pronouncements Adopted in 2025 In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. The amendments require entities to disclose specific categories in the rate reconciliation and provide additional information for material reconciling items. The ASU also requires the disclosure of income taxes paid disaggregated by jurisdiction. The amendments in this ASU are effective for public business entities for annual periods beginning after December 15, 2024. The guidance should be applied on a prospective or retrospective basis. Early adoption is permitted. This ASU is not expected to have a significant impact on the Company’s financial statements. Recent Accounting Pronouncements In November 2024, the FASB issued ASU 2024-03, Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic 220- 40): Disaggregation of Income Statement Expenses. The guidance requires public companies to disclose additional information about certain types of costs and expenses in the footnotes. The new standard requires a tabular disclosure of defined natural expense categories along with expenses subject to existing disclosure requirements. The amendment should be applied on a prospective basis with the option for retrospective application. The amendments in this ASU are effective for annual periods beginning after December 15, 2026, and interim reporting periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted. The effective date was clarified in ASU 2025-01, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Clarifying the Effective Date, which was issued in January 2025. These ASUs are not expected to have a significant impact on the Company’s financial statements. In August 2025, the FASB issued ASU 2025-05, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets. The guidance relates to the calculation of current expected credit losses for current accounts receivable and contract assets arising from revenue transactions accounted for under ASC 606, Revenue from Contracts with Customers. The guidance provides a practical expedient to assume that current conditions as of the balance sheet date will persist through the reasonable and supportable forecast period. The guidance is effective for annual reporting periods beginning after December 15, 2025, including interim periods within those fiscal years. This guidance is to be adopted on a prospective basis. Early adoption is permitted. This ASU is not expected to have a significant impact on the Company’s financial statements. In September 2025, the FASB issued ASU 2025-06, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software. The guidance makes targeted improvements to the accounting for internal-use software by updating guidance for when entities will begin capitalizing eligible costs. The scope includes costs incurred to develop or obtain software for internal use, costs incurred to implement a cloud computing arrangement as a customer, and website development costs. This ASU is effective for annual periods beginning after December 15, 2027, and interim periods within those annual periods. Adoption can be applied on a prospective basis, a modified basis for in-process projects, or a retrospective basis. Early adoption is permitted. We are currently reviewing the impact that the ASU will have on the Company’s financial statements.

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- Definition Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483426/235-10-50-4 + Details
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- Definition Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact. + References No definition available. + Details
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