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Note 14 - Employee Benefits (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Retirement Plan [Member] |  |  |
Note 14 - Employee Benefits (Details) [Line Items] |  |  |
Deferred Compensation Arrangement with Individual, Requisite Service Period | 1 year |  |
Defined Contribution Plan, Employer Voluntary Matching, Bank Contribution | 50.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 6.00% |  |
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 | $ 156,000 | $ 143,000 | $ 155,000
Stock Option and Restricted Stock Plan [Member] |  |  |
Note 14 - Employee Benefits (Details) [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) | 160,000 |  |
Omnibus Equity Plan [Member] |  |  |
Note 14 - Employee Benefits (Details) [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) | 0 | 0 |
Middlefield Banking Company [Member] | Retirement Plan [Member] |  |  |
Note 14 - Employee Benefits (Details) [Line Items] |  |  |
Defined Contribution Plan Annual Vesting Percentage | 20.00% |  |
Middlefield Banking Company [Member] | Directors Retirement Plan [Member] |  |  |
Note 14 - Employee Benefits (Details) [Line Items] |  |  |
Deferred Compensation Arrangement with Individual, Requisite Service Period | 5 years |  |
Retirement Benefits Term | 10 years |  |
Post-retirement Benefits Percentage of Compensation | 25.00% |  |
Middlefield Banking Company [Member] | Executive Deferred Compensation Plan [Member] |  |  |
Note 14 - Employee Benefits (Details) [Line Items] |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 65,000 | $ 115,000 | $ 120,000
Maximum [Member] | Stock Option and Restricted Stock Plan [Member] |  |  |
Note 14 - Employee Benefits (Details) [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term | 10 years |  |

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- Definition Defined Contribution Plan Annual Vesting Percentage + References No definition available. + Details
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- Definition The percentage of matching voluntary contributions that the bank bases its contributions to the plan on. + References No definition available. + Details
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- Definition Postretirement benefits percentage of compensation. + References No definition available. + Details
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- Definition Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, 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 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 Reference 2: 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=58740216&loc=d3e1928-114920 + 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 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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- 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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