Note 1 - Basis of Presentation	9 Months Ended
Sep. 30, 2022
Notes to Financial Statements
Significant Accounting Policies [Text Block]	NOTE 1 - BASIS OF PRESENTATION The consolidated financial statements of Middlefield Banc Corp. ("Company") include its bank subsidiary, The Middlefield Banking Company (“MBC” or “Middlefield 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 Middlefield Insurance Services. All significant inter-company items have been eliminated. In the first quarter of 2022, MBC established a wholly-owned subsidiary named Middlefield Insurance Services (MIS), headquartered in Middlefield, Ohio. This operating subsidiary exists to offer retail and business customers a variety of insurance services, including home, renters, automobile, pet, identity theft, travel, and professional liability insurance. At September 30, 2022, MIS’s assets consist of a cash account, a prepaid asset, and an accounts receivable. All significant inter-company items have been eliminated between MBC and this subsidiary. The unaudited condensed consolidated financial statements have been prepared in conformity with the instructions to Form 10-Q and Article 10 of Regulation S-X. 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, 2021. 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. In preparing the financial statements, management is required to make estimates and assumptions that affect the reported amounts and liabilities as of the balance sheet date and revenues and expenses for the period. Actual results could differ from those estimates. Recently Issued Accounting Pronouncements In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses: Measurement of Credit Losses on Financial Instruments, which changes the impairment model for most financial assets. This Update is intended to improve financial reporting by requiring timelier recording of credit losses on loans and other financial instruments held by financial institutions and other organizations. The underlying premise of the Update is that financial assets measured at amortized cost should be presented at the net amount expected to be collected through an allowance for credit losses that is deducted from the amortized cost basis. The allowance for credit losses should reflect management’s current estimate of credit losses that is expected to occur over the remaining life of a financial asset. The income statement will be affected by the measurement of credit losses for newly recognized financial assets, as well as the expected increases or decreases of expected credit losses that have taken place during the period. With certain exceptions, the transition to the new requirements will be through a cumulative-effect adjustment to opening retained earnings as of the beginning of the first reporting period in which the guidance is adopted. This Update is effective for SEC filers that are eligible to be smaller reporting companies, non-SEC filers, and all other companies, to fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. We expect to recognize a one-time cumulative-effect adjustment to the allowance for loan losses as of the beginning of the first reporting period in which the new standard is effective but cannot yet determine the magnitude of any such one-time adjustment or the overall impact of the new guidance on the consolidated financial statements. Management will continue to monitor model output throughout the deferral period. Current Expected Credit Loss (CECL) Adoption The Company continues to monitor the opportunity to early adopt ASC Topic 326, which replaces the current incurred loss approach for measuring credit losses with an expected loss model. CECL applies to financial assets subject to credit losses and measured at amortized cost and certain off-balance-sheet credit exposures, which include, but are not limited to, loans, leases, held-to-maturity securities, loan commitments, and financial guarantees. Expected results of adoption are challenging to forecast due to the evolving macroeconomic landscape. Early adoption of CECL is unlikely. In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment. To simplify the subsequent measurement of goodwill, the FASB eliminated Step 2 from the goodwill impairment test. In computing the implied fair value of goodwill under Step 2, an entity had to perform procedures to determine the fair value at the impairment testing date of its assets and liabilities (including unrecognized assets and liabilities) following the procedure that would be required in determining the fair value of assets acquired and liabilities assumed in a business combination. Instead, under the amendments in this Update, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. The Update is effective for smaller reporting companies and all other entities for fiscal years beginning after December 15, 2022, and interim periods within those fiscal years. This Update is not expected to have a significant impact on the Company’s financial statements. In November 2019, the FASB issued ASU 2019-11, Codification Improvements to Topic 326,* Financial Instruments* – Credit Losses, to clarify its new credit impairment guidance in ASC 326, based on implementation issues raised by stakeholders. This Update clarified, among other things, that expected recoveries are to be included in the allowance for credit losses for these financial assets; an accounting policy election can be made to adjust the effective interest rate for existing troubled debt restructurings based on the prepayment assumptions instead of the prepayment assumptions applicable immediately prior to the restructuring event; and extends the practical expedient to exclude accrued interest receivable from all additional relevant disclosures involving amortized cost basis. For entities that have not yet adopted ASU 2016-13 as of November 26, 2019, the effective dates for ASU 2019-11 are the same as the effective dates and transition requirements in ASU 2016-13. For entities that have adopted ASU 2016-13, ASU 2019-11 is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The Company qualifies as a smaller reporting company and does not expect to early adopt these ASUs. In January 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting, March 2020, to provide temporary optional expedients and exceptions to the U.S. GAAP guidance on contract modifications and hedge accounting to ease the financial reporting burdens of the expected market transition from LIBOR and other interbank offered rates to alternative reference rates, such as the Secured Overnight Financing Rate. Entities can elect not to apply certain modification accounting requirements to contracts affected by what the guidance calls “reference rate reform” if certain criteria are met. An entity that makes this election would not have to remeasure the contracts at the modification date or reassess a previous accounting determination. Also, entities can elect various optional expedients that would allow them to continue applying hedge accounting for hedging relationships affected by reference rate reform if certain criteria are met, and can make a one-time election to sell and/or reclassify held-to-maturity debt securities that reference an interest rate affected by reference rate reform. The amendments in this ASU are effective for all entities upon issuance through December 31, 2022. It is too early to predict whether a new rate index replacement and the adoption of the ASU will have a material impact on the Company’s financial statements. In March 2022, the FASB issued ASU 2022-02, Financial Instruments—Credit Losses (Topic 326) - Troubled Debt Restructurings (TDR) and Vintage Disclosures to update the TDR guidance and required vintage disclosures in ASC 326, based on implementation issues raised by stakeholders. The amendments in this Update eliminate the accounting guidance for TDRs by creditors in Subtopic 310-40, Receivables—Troubled Debt Restructurings by Creditors, while enhancing disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty. Specifically, rather than applying the recognition and measurement guidance for TDRs, an entity must apply the loan refinancing and restructuring guidance in paragraphs 310-20-35-9 through 35-11 to determine whether a modification results in a new loan or a continuation of an existing loan. For public business entities, the amendments in this Update require that an entity disclose current-period gross write-offs by year of origination for financing receivables and net investments in leases within the scope of Subtopic 326-20, Financial Instruments—Credit Losses—Measured at Amortized Cost. The amendments in this ASU are effective for all entities upon adoption of ASU 2016-13. In June 2022, the FASB issued ASU 2022-03, Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions. These amendments clarify that a contractual restriction on the sale of an equity security is not considered part of the unit of account of the equity security and, therefore, is not considered in measuring fair value. This guidance is effective for public business entities for fiscal years including interim periods within those fiscal years beginning after December 15, 2023. Early adoption is permitted. The Company has assessed ASU 2022-03 and does not expect it to have a material impact on its accounting and disclosures. Reclassification of Comparative Amounts Certain comparative amounts for prior years have been reclassified to conform to current-year presentations. Such reclassifications did not affect net income or retained earnings.

Note 1 - Basis of Presentation

9 Months Ended

Sep. 30, 2022

Significant Accounting Policies [Text Block]

NOTE 1 - BASIS OF PRESENTATION

The consolidated financial statements of Middlefield Banc Corp. ("Company") include its bank subsidiary, The Middlefield Banking Company (“MBC” or “Middlefield 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 Middlefield Insurance Services. All significant inter-company items have been eliminated.

In the first quarter of 2022, MBC established a wholly-owned subsidiary named Middlefield Insurance Services (MIS), headquartered in Middlefield, Ohio. This operating subsidiary exists to offer retail and business customers a variety of insurance services, including home, renters, automobile, pet, identity theft, travel, and professional liability insurance. At September 30, 2022, MIS’s assets consist of a cash account, a prepaid asset, and an accounts receivable. All significant inter-company items have been eliminated between MBC and this subsidiary.

The unaudited condensed consolidated financial statements have been prepared in conformity with the instructions to Form 10-Q and Article 10 of Regulation S-X. 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, 2021. 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.

In preparing the financial statements, management is required to make estimates and assumptions that affect the reported amounts and liabilities as of the balance sheet date and revenues and expenses for the period. Actual results could differ from those estimates.

Recently Issued Accounting Pronouncements

In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses: Measurement of Credit Losses on Financial Instruments, which changes the impairment model for most financial assets. This Update is intended to improve financial reporting by requiring timelier recording of credit losses on loans and other financial instruments held by financial institutions and other organizations. The underlying premise of the Update is that financial assets measured at amortized cost should be presented at the net amount expected to be collected through an allowance for credit losses that is deducted from the amortized cost basis. The allowance for credit losses should reflect management’s current estimate of credit losses that is expected to occur over the remaining life of a financial asset. The income statement will be affected by the measurement of credit losses for newly recognized financial assets, as well as the expected increases or decreases of expected credit losses that have taken place during the period. With certain exceptions, the transition to the new requirements will be through a cumulative-effect adjustment to opening retained earnings as of the beginning of the first reporting period in which the guidance is adopted. This Update is effective for SEC filers that are eligible to be smaller reporting companies, non-SEC filers, and all other companies, to fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. We expect to recognize a one-time cumulative-effect adjustment to the allowance for loan losses as of the beginning of the first reporting period in which the new standard is effective but cannot yet determine the magnitude of any such one-time adjustment or the overall impact of the new guidance on the consolidated financial statements. Management will continue to monitor model output throughout the deferral period.

Current Expected Credit Loss (CECL) Adoption The Company continues to monitor the opportunity to early adopt ASC Topic 326, which replaces the current incurred loss approach for measuring credit losses with an expected loss model. CECL applies to financial assets subject to credit losses and measured at amortized cost and certain off-balance-sheet credit exposures, which include, but are not limited to, loans, leases, held-to-maturity securities, loan commitments, and financial guarantees. Expected results of adoption are challenging to forecast due to the evolving macroeconomic landscape. Early adoption of CECL is unlikely.

In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment. To simplify the subsequent measurement of goodwill, the FASB eliminated Step 2 from the goodwill impairment test. In computing the implied fair value of goodwill under Step 2, an entity had to perform procedures to determine the fair value at the impairment testing date of its assets and liabilities (including unrecognized assets and liabilities) following the procedure that would be required in determining the fair value of assets acquired and liabilities assumed in a business combination. Instead, under the amendments in this Update, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. The Update is effective for smaller reporting companies and all other entities for fiscal years beginning after December 15, 2022, and interim periods within those fiscal years. This Update is not expected to have a significant impact on the Company’s financial statements.

In November 2019, the FASB issued ASU 2019-11, Codification Improvements to Topic 326, Financial Instruments – Credit Losses, to clarify its new credit impairment guidance in ASC 326, based on implementation issues raised by stakeholders. This Update clarified, among other things, that expected recoveries are to be included in the allowance for credit losses for these financial assets; an accounting policy election can be made to adjust the effective interest rate for existing troubled debt restructurings based on the prepayment assumptions instead of the prepayment assumptions applicable immediately prior to the restructuring event; and extends the practical expedient to exclude accrued interest receivable from all additional relevant disclosures involving amortized cost basis. For entities that have not yet adopted ASU 2016-13 as of November 26, 2019, the effective dates for ASU 2019-11 are the same as the effective dates and transition requirements in ASU 2016-13. For entities that have adopted ASU 2016-13, ASU 2019-11 is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The Company qualifies as a smaller reporting company and does not expect to early adopt these ASUs.

In January 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting, March 2020, to provide temporary optional expedients and exceptions to the U.S. GAAP guidance on contract modifications and hedge accounting to ease the financial reporting burdens of the expected market transition from LIBOR and other interbank offered rates to alternative reference rates, such as the Secured Overnight Financing Rate. Entities can elect not to apply certain modification accounting requirements to contracts affected by what the guidance calls “reference rate reform” if certain criteria are met. An entity that makes this election would not have to remeasure the contracts at the modification date or reassess a previous accounting determination. Also, entities can elect various optional expedients that would allow them to continue applying hedge accounting for hedging relationships affected by reference rate reform if certain criteria are met, and can make a one-time election to sell and/or reclassify held-to-maturity debt securities that reference an interest rate affected by reference rate reform. The amendments in this ASU are effective for all entities upon issuance through December 31, 2022. It is too early to predict whether a new rate index replacement and the adoption of the ASU will have a material impact on the Company’s financial statements.

In March 2022, the FASB issued ASU 2022-02, Financial Instruments—Credit Losses (Topic 326) - Troubled Debt Restructurings (TDR) and Vintage Disclosures to update the TDR guidance and required vintage disclosures in ASC 326, based on implementation issues raised by stakeholders. The amendments in this Update eliminate the accounting guidance for TDRs by creditors in Subtopic 310-40, Receivables—Troubled Debt Restructurings by Creditors, while enhancing disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty. Specifically, rather than applying the recognition and measurement guidance for TDRs, an entity must apply the loan refinancing and restructuring guidance in paragraphs 310-20-35-9 through 35-11 to determine whether a modification results in a new loan or a continuation of an existing loan. For public business entities, the amendments in this Update require that an entity disclose current-period gross write-offs by year of origination for financing receivables and net investments in leases within the scope of Subtopic 326-20, Financial Instruments—Credit Losses—Measured at Amortized Cost. The amendments in this ASU are effective for all entities upon adoption of ASU 2016-13.

In June 2022, the FASB issued ASU 2022-03, Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions. These amendments clarify that a contractual restriction on the sale of an equity security is not considered part of the unit of account of the equity security and, therefore, is not considered in measuring fair value. This guidance is effective for public business entities for fiscal years including interim periods within those fiscal years beginning after December 15, 2023. Early adoption is permitted. The Company has assessed ASU 2022-03 and does not expect it to have a material impact on its accounting and disclosures.

Reclassification of Comparative Amounts

Certain comparative amounts for prior years have been reclassified to conform to current-year presentations. Such reclassifications did not affect net income or retained earnings.