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

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- Definition 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 + Details
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- Definition 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 + Details
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- Definition 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 8 -Article 5 + Details
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- Definition The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 7 + Details
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- Definition Amount of other miscellaneous assets. + References No definition available. + Details
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- Definition 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 + Details
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