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Note 7 - Other Assets (Details) - Components of Other Assets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Note 7 - Other Assets (Details) - Components of Other Assets [Line Items]
FHLB stock	$ 1,887us-gaap_FederalHomeLoanBankStock	$ 1,887us-gaap_FederalHomeLoanBankStock
Accrued interest	2,095us-gaap_InterestReceivable	2,135us-gaap_InterestReceivable
Deferred tax asset, net	1,484us-gaap_DeferredTaxAssetsNet	3,688us-gaap_DeferredTaxAssetsNet
Other real estate owned	2,590us-gaap_OtherRealEstateAndForeclosedAssets	2,698us-gaap_OtherRealEstateAndForeclosedAssets
Other	1,579us-gaap_OtherAssetsMiscellaneous	1,308us-gaap_OtherAssetsMiscellaneous
Total	9,635us-gaap_OtherAssets	11,716us-gaap_OtherAssets
Investment Securities [Member]
Note 7 - Other Assets (Details) - Components of Other Assets [Line Items]
Accrued interest	1,005us-gaap_InterestReceivable / invest_InvestmentAxis = mbcn_InvestmentSecuritiesMember	1,029us-gaap_InterestReceivable / invest_InvestmentAxis = mbcn_InvestmentSecuritiesMember
Loans 1 [Member]
Note 7 - Other Assets (Details) - Components of Other Assets [Line Items]
Accrued interest	$ 1,090us-gaap_InterestReceivable / invest_InvestmentAxis = mbcn_Loans1Member	$ 1,106us-gaap_InterestReceivable / invest_InvestmentAxis = mbcn_Loans1Member

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b),(c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 325

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6478792&loc=d3e63345-112809

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.8)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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Amount of other miscellaneous assets.

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No definition available.

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Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10(4))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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