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Note 13 - Employee Benefits (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Note 13 - Employee Benefits (Details) [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term |  |  | 9 years 350 days
Maximum Matching Contribution [Member] | Retirement Plan [Member] |  |  |
Note 13 - Employee Benefits (Details) [Line Items] |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 6.00% |  |
Middlefield Banking Company [Member] | Retirement Plan [Member] |  |  |
Note 13 - Employee Benefits (Details) [Line Items] |  |  |
Defined Contribution Plan Annual Vesting Percentage | 20.00% |  |
Middlefield Banking Company [Member] | Directors Retirement Plan [Member] |  |  |
Note 13 - Employee Benefits (Details) [Line Items] |  |  |
Deferred Compensation Arrangement with Individual, Requisite Service Period | five |  |
Retirement Benefits Term | 10 years |  |
Postretirement Benefits Percentage of Compensation | 25.00% |  |
Middlefield Banking Company [Member] | Executive Deferred Compensation Plan [Member] |  |  |
Note 13 - Employee Benefits (Details) [Line Items] |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount (in Dollars) | $ 120,000 | $ 139,000 | $ 91,000
Emerald Bank [Member] | Retirement Plan [Member] | After One Year of Employment [Member] |  |  |
Note 13 - Employee Benefits (Details) [Line Items] |  |  |
Defined Contribution Plan Annual Vesting Percentage | 50.00% |  |
Emerald Bank [Member] | Retirement Plan [Member] | After Two Years of Employment [Member] |  |  |
Note 13 - Employee Benefits (Details) [Line Items] |  |  |
Defined Contribution Plan Annual Vesting Percentage | 75.00% |  |
Retirement Plan [Member] |  |  |
Note 13 - Employee Benefits (Details) [Line Items] |  |  |
Deferred Compensation Arrangement with Individual, Requisite Service Period | one |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 50.00% |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 100.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 6 years |  |
Defined Benefit Plan, Contributions by Employer (in Dollars) | $ 155,000 | $ 125,000 | $ 104,000
Retirement Plan [Member] | Less Than One Year of Employment [Member] |  |  |
Note 13 - Employee Benefits (Details) [Line Items] |  |  |
Defined Contribution Plan Annual Vesting Percentage | 25.00% |  |
Stock Option and Restricted Stock Plan [Member] |  |  |
Note 13 - Employee Benefits (Details) [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) | 160,000 |  |
Stock Option and Restricted Stock Plan [Member] | Maximum [Member] |  |  |
Note 13 - Employee Benefits (Details) [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term | 10 years |  |
Omnibus Equity Plan [Member] |  |  |
Note 13 - Employee Benefits (Details) [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) | 0 | 1,722 | 2,400

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- Definition Defined Contribution Plan Annual Vesting Percentage + References No definition available. + Details
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- Details
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- Definition Postretirement benefits percentage of compensation. + References No definition available. + Details
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- Definition The minimum period that the individual is required to perform services in order to be fully vested under the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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