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Note 13 - Employee Benefits (Details) - Stocks Options Outstanding by Grant Date (USD $) | 12 Months Ended |  |
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 13 - Employee Benefits (Details) - Stocks Options Outstanding by Grant Date [Line Items] |  |  |
Shares Outstanding | 46,451 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 58,581 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 79,693 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Average Exercise Price, Outstanding (in Dollars per share) | $ 27.90 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 28.38 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 27.25 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Shares, Exercisable | 46,451 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber | 58,581 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber |
Average Exercise Price, Exercisable (in Dollars per share) | $ 27.90 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice | $ 28.38 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice |
Granted December 14, 2005 [Member] |  |  |
Note 13 - Employee Benefits (Details) - Stocks Options Outstanding by Grant Date [Line Items] |  |  |
Shares Outstanding | 7,163 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = mbcn_GrantedDecember142005Member |  |
Contractual Average Life, Outstanding | 346 days |  |
Average Exercise Price, Outstanding (in Dollars per share) | $ 36.73 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = mbcn_GrantedDecember142005Member |  |
Shares, Exercisable | 7,163 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_PlanNameAxis = mbcn_GrantedDecember142005Member |  |
Average Exercise Price, Exercisable (in Dollars per share) | $ 36.73 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_PlanNameAxis = mbcn_GrantedDecember142005Member |  |
Granted December 10, 2006 [Member] |  |  |
Note 13 - Employee Benefits (Details) - Stocks Options Outstanding by Grant Date [Line Items] |  |  |
Shares Outstanding | 3,150 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = mbcn_GrantedDecember102006Member |  |
Contractual Average Life, Outstanding | 1 year 343 days |  |
Average Exercise Price, Outstanding (in Dollars per share) | $ 40.24 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = mbcn_GrantedDecember102006Member |  |
Shares, Exercisable | 3,150 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_PlanNameAxis = mbcn_GrantedDecember102006Member |  |
Average Exercise Price, Exercisable (in Dollars per share) | $ 40.24 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_PlanNameAxis = mbcn_GrantedDecember102006Member |  |
Granted April 19, 2007 [Member] |  |  |
Note 13 - Employee Benefits (Details) - Stocks Options Outstanding by Grant Date [Line Items] |  |  |
Shares Outstanding | 3,639 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = mbcn_GrantedApril192007Member |  |
Contractual Average Life, Outstanding | 2 years 105 days |  |
Average Exercise Price, Outstanding (in Dollars per share) | $ 37.33 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = mbcn_GrantedApril192007Member |  |
Shares, Exercisable | 3,639 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_PlanNameAxis = mbcn_GrantedApril192007Member |  |
Average Exercise Price, Exercisable (in Dollars per share) | $ 37.33 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_PlanNameAxis = mbcn_GrantedApril192007Member |  |
Granted May 16, 2007 [Member] |  |  |
Note 13 - Employee Benefits (Details) - Stocks Options Outstanding by Grant Date [Line Items] |  |  |
Shares Outstanding | 1,337 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = mbcn_GrantedMay162007Member |  |
Contractual Average Life, Outstanding | 2 years 135 days |  |
Average Exercise Price, Outstanding (in Dollars per share) | $ 37.48 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = mbcn_GrantedMay162007Member |  |
Shares, Exercisable | 1,337 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_PlanNameAxis = mbcn_GrantedMay162007Member |  |
Average Exercise Price, Exercisable (in Dollars per share) | $ 37.48 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_PlanNameAxis = mbcn_GrantedMay162007Member |  |
Granted December 10, 2007 [Member] |  |  |
Note 13 - Employee Benefits (Details) - Stocks Options Outstanding by Grant Date [Line Items] |  |  |
Shares Outstanding | 2,450 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = mbcn_GrantedDecember102007Member |  |
Contractual Average Life, Outstanding | 2 years 343 days |  |
Average Exercise Price, Outstanding (in Dollars per share) | $ 37.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = mbcn_GrantedDecember102007Member |  |
Shares, Exercisable | 2,450 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_PlanNameAxis = mbcn_GrantedDecember102007Member |  |
Average Exercise Price, Exercisable (in Dollars per share) | $ 37.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_PlanNameAxis = mbcn_GrantedDecember102007Member |  |
Granted January 2, 2008 [Member] |  |  |
Note 13 - Employee Benefits (Details) - Stocks Options Outstanding by Grant Date [Line Items] |  |  |
Shares Outstanding | 1,337 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = mbcn_GrantedJanuary22008Member |  |
Contractual Average Life, Outstanding | 3 years |  |
Average Exercise Price, Outstanding (in Dollars per share) | $ 36.25 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = mbcn_GrantedJanuary22008Member |  |
Shares, Exercisable | 1,337 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_PlanNameAxis = mbcn_GrantedJanuary22008Member |  |
Average Exercise Price, Exercisable (in Dollars per share) | $ 36.25 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_PlanNameAxis = mbcn_GrantedJanuary22008Member |  |
Granted November 10, 2008 [Member] |  |  |
Note 13 - Employee Benefits (Details) - Stocks Options Outstanding by Grant Date [Line Items] |  |  |
Shares Outstanding | 18,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = mbcn_GrantedNovember102008Member |  |
Contractual Average Life, Outstanding | 3 years 313 days |  |
Average Exercise Price, Outstanding (in Dollars per share) | $ 23.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = mbcn_GrantedNovember102008Member |  |
Shares, Exercisable | 18,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_PlanNameAxis = mbcn_GrantedNovember102008Member |  |
Average Exercise Price, Exercisable (in Dollars per share) | $ 23.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_PlanNameAxis = mbcn_GrantedNovember102008Member |  |
Granted May 9, 2011 [Member] |  |  |
Note 13 - Employee Benefits (Details) - Stocks Options Outstanding by Grant Date [Line Items] |  |  |
Shares Outstanding | 8,875 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = mbcn_GrantedMay92011Member |  |
Contractual Average Life, Outstanding | 6 years 127 days |  |
Average Exercise Price, Outstanding (in Dollars per share) | $ 17.55 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = mbcn_GrantedMay92011Member |  |
Shares, Exercisable | 8,875 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_PlanNameAxis = mbcn_GrantedMay92011Member |  |
Average Exercise Price, Exercisable (in Dollars per share) | $ 17.55 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_PlanNameAxis = mbcn_GrantedMay92011Member |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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