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Note 17 - Fair Value Disclosure Measurements (Details) - Additional Quantitative Information About Assets Measured at Fair Value on Non-recurring Basis (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013
Appraisal Adjustments [Member] | Impaired Loans [Member] | Minimum [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Range | 0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = mbcn_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = mbcn_AppraisalAdjustmentsMember | [1] |
Appraisal Adjustments [Member] | Impaired Loans [Member] | Maximum [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Range | (84.60%)us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = mbcn_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = mbcn_AppraisalAdjustmentsMember | [1] |
Appraisal Adjustments [Member] | Impaired Loans [Member] | Weighted Average [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Range | (25.50%)us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = mbcn_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = mbcn_AppraisalAdjustmentsMember |  |
Appraisal Adjustments [Member] | Impaired Loans [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fair Value Estimate (in Dollars) | $ 12,772 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = mbcn_ImpairedLoansMember / us-gaap_ValuationTechniqueAxis = mbcn_AppraisalAdjustmentsMember |  | $ 17,158 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = mbcn_ImpairedLoansMember / us-gaap_ValuationTechniqueAxis = mbcn_AppraisalAdjustmentsMember
Valuation Techniques/Unobservable Input | Appraisal of collateral (1) | [2] |
Appraisal Adjustments [Member] | Other Real Estate Owned [Member] | Minimum [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Range | 0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = mbcn_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = mbcn_AppraisalAdjustmentsMember | [1] |
Appraisal Adjustments [Member] | Other Real Estate Owned [Member] | Maximum [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Range | (10.00%)us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = mbcn_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = mbcn_AppraisalAdjustmentsMember | [1] |
Appraisal Adjustments [Member] | Other Real Estate Owned [Member] | Weighted Average [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Range | (7.50%)us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = mbcn_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = mbcn_AppraisalAdjustmentsMember |  |
Appraisal Adjustments [Member] | Other Real Estate Owned [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fair Value Estimate (in Dollars) | $ 2,590 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = mbcn_OtherRealEstateOwnedMember / us-gaap_ValuationTechniqueAxis = mbcn_AppraisalAdjustmentsMember |  | $ 2,698 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = mbcn_OtherRealEstateOwnedMember / us-gaap_ValuationTechniqueAxis = mbcn_AppraisalAdjustmentsMember
Valuation Techniques/Unobservable Input | Appraisal of collateral (1), (3) | [2],[3] |
Liquidation Expenses [Member] | Impaired Loans [Member] | Minimum [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Range | 0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = mbcn_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = mbcn_LiquidationExpensesMember | [1] |
Liquidation Expenses [Member] | Impaired Loans [Member] | Maximum [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Range | (100.00%)us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = mbcn_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = mbcn_LiquidationExpensesMember | [1] |
Liquidation Expenses [Member] | Impaired Loans [Member] | Weighted Average [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Range | (25.90%)us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = mbcn_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = mbcn_LiquidationExpensesMember |  |
[1] | Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. The range and weighted average of liquidation expenses and other appraisal adjustments are presented as a percent of the appraisal.
[2] | Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various level 3 inputs which are not identifiable.
[3] | Includes qualitative adjustments by management and estimated liquidation expenses.

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
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X
- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=mbcn_LiquidationExpensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |