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Note 1 - Basis of Presentation
 9 Months Ended
Sep. 30, 2012
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]

NOTE 1 - BASIS OF PRESENTATION

The consolidated financial statements of Middlefield Banc Corp. ("Company") include its two bank subsidiaries, The Middlefield Banking Company (“MB”) and Emerald Bank (“EB”), and a non-bank asset resolution subsidiary EMORECO, Inc. All significant inter-company items have been eliminated.

The accompanying financial statements have been prepared in accordance with U.S. generally accepted accounting principles and the instructions for Form 10-Q and Article 10 of Regulation S-X.  In management’s opinion, the financial statements include all adjustments, consisting of normal recurring adjustments, that the Company considers necessary to fairly state the Company’s financial position and the results of operations and cash flows.  The consolidated balance sheet at December 31, 2011, has been derived from the audited financial statements at that date but does not include all of the necessary informational disclosures and footnotes as required by U. S. generally accepted accounting principles.  The accompanying consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included with Middlefield’s Form 10-K for the year ended December 31, 2011 (File No. 000-32561). The results of Middlefield’s operations for any interim period are not necessarily indicative of the results of Middlefield’s operations for any other interim period or for a full fiscal year.

Recent Accounting Pronouncements

In September 2011, the FASB issued ASU 2011-08, Intangibles – Goodwill and Other Topics (Topic 350), Testing Goodwill for Impairment.  The objective of this Update is to simplify how entities, both public and nonpublic, test goodwill for impairment.  The amendments in the Update permit an entity to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test described in Topic 350.  The more-likely-than-not threshold is defined as having a likelihood of more than 50 percent.  Under the amendments in this Update, an entity is not required to calculate the fair value of a reporting unit unless the entity determines that it is more likely than not that its fair value is less than its carrying amount.  The amendments in this Update apply to all entities, both public and nonpublic, that have goodwill reported in their financial statements and are effective for interim and annual goodwill impairment tests performed for fiscal years beginning after December 15, 2011.  Early adoption is permitted, including for annual and interim goodwill impairment tests performed as of a date before September 15, 2011, if an entity’s financial statements for the most recent annual or interim period have not yet been issued or, for nonpublic entities, have not yet been made available for issuance.  This ASU did not have a significant impact on the Company’s financial statements.

In December 2011, the FASB issued ASU 2011-11, Balance Sheet (Topic 210):  Disclosures about Offsetting Assets and Liabilities.  The amendments in this Update affect all entities that have financial instruments and derivative instruments that are either (1) offset in accordance with either Section 210-20-45 or Section 815-10-45 or (2) subject to an enforceable master netting arrangement or similar agreement.  The requirements amend the disclosure requirements on offsetting in Section 210-20-50.  This information will enable users of an entity's financial statements to evaluate the effect or potential effect of netting arrangements on an entity's financial position, including the effect or potential effect of rights of setoff associated with certain financial instruments and derivative instruments in the scope of this Update.  An entity is required to apply the amendments for annual reporting periods beginning on or after January 1, 2013, and interim periods within those annual periods.  An entity should provide the disclosures required by those amendments retrospectively for all comparative periods presented.  This ASU is not expected to have a significant impact on the Company’s financial statements.